Updated on 2026/02/03

写真a

 
YASHIMA MASATOMO
 
Organization
School of Science Professor
Title
Professor
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Research Areas

  • Nanotechnology/Materials / Inorganic materials and properties

Papers

  • High Oxide-Ion Conduction in Rb-Containing Oxides

    Yuta Yasui, Kazuaki Jojima, Kotaro Fujii, Kazuhiro Mori, Masatomo Yashima

    Chemistry of Materials   37 ( 3 )   1231 - 1243   2025.2

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/acs.chemmater.4c03148

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  • High Proton Conduction in the Octahedral Layers of Fully Hydrated Hexagonal Perovskite-Related Oxides

    Kohei Matsuzaki, Kei Saito, Yoichi Ikeda, Yusuke Nambu, Masatomo Yashima

    Journal of the American Chemical Society   2024.6

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/jacs.4c04325

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  • High Conductivity and Diffusion Mechanism of Oxide Ions in Triple Fluorite-Like Layers of Oxyhalides

    Nachi Ueno, Hiroshi Yaguchi, Kotaro Fujii, Masatomo Yashima

    Journal of the American Chemical Society   2024.4

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/jacs.4c00265

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  • High proton conductivity within the ‘Norby gap’ by stabilizing a perovskite with disordered intrinsic oxygen vacancies

    Kei Saito, Masatomo Yashima

    Nature Communications   14 ( 1 )   7466 - 7466   2023.11

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    Proton conductors are attractive materials with a wide range of potential applications such as proton-conducting fuel cells (PCFCs). The conventional strategy to enhance the proton conductivity is acceptor doping into oxides without oxygen vacancies. However, the acceptor doping results in proton trapping near dopants, leading to the high apparent activation energy and low proton conductivity at intermediate and low temperatures. The hypothetical cubic perovskite BaScO2.5 may have intrinsic oxygen vacancies without the acceptor doping. Herein, we report that the cubic perovskite-type BaSc0.8Mo0.2O2.8 stabilized by Mo donor-doing into BaScO2.5 exhibits high proton conductivity within the ‘Norby gap’ (e.g., 0.01 S cm−1 at 320 °C) and high chemical stability under oxidizing, reducing and CO2 atmospheres. The high proton conductivity of BaSc0.8Mo0.2O2.8 at intermediate and low temperatures is attributable to high proton concentration, high proton mobility due to reduced proton trapping, and three-dimensional proton diffusion in the cubic perovskite stabilized by the Mo-doping into BaScO2.5. The donor doping into the perovskite with disordered intrinsic oxygen vacancies would be a viable strategy towards high proton conductivity at intermediate and low temperatures.

    DOI： 10.1038/s41467-023-43122-4

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    Other Link： https://www.nature.com/articles/s41467-023-43122-4

  • High proton conduction in Ba2LuAlO5 with highly oxygen-deficient layers Reviewed

    Riho Morikawa, Taito Murakami, Kotaro Fujii, Maxim Avdeev, Yoichi Ikeda, Yusuke Nambu, Masatomo Yashima

    Communications Materials   2023.6

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s43246-023-00364-5

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  • Hidden chemical order in disordered Ba7Nb4MoO20 revealed by resonant X-ray diffraction and solid-state NMR Reviewed

    Yuta Yasui, Masataka Tansho, Kotaro Fujii, Yuichi Sakuda, Atsushi Goto, Shinobu Ohki, Yuuki Mogami, Takahiro Iijima, Shintaro Kobayashi, Shogo Kawaguchi, Keiichi Osaka, Kazutaka Ikeda, Toshiya Otomo, Masatomo Yashima

    Nature Communications   14 ( 1 )   2023.4

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    The chemical order and disorder of solids have a decisive influence on the material properties. There are numerous materials exhibiting chemical order/disorder of atoms with similar X-ray atomic scattering factors and similar neutron scattering lengths. It is difficult to investigate such order/disorder hidden in the data obtained from conventional diffraction methods. Herein, we quantitatively determined the Mo/Nb order in the high ion conductor Ba7Nb4MoO20 by a technique combining resonant X-ray diffraction, solid-state nuclear magnetic resonance (NMR) and first-principle calculations. NMR provided direct evidence that Mo atoms occupy only the M2 site near the intrinsically oxygen-deficient ion-conducting layer. Resonant X-ray diffraction determined the occupancy factors of Mo atoms at the M2 and other sites to be 0.50 and 0.00, respectively. These findings provide a basis for the development of ion conductors. This combined technique would open a new avenue for in-depth investigation of the hidden chemical order/disorder in materials.

    DOI： 10.1038/s41467-023-37802-4

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    Other Link： https://www.nature.com/articles/s41467-023-37802-4

  • High Oxide‐Ion Conductivity through the Interstitial Oxygen Site in Sillén Oxychlorides Reviewed

    Hiroshi Yaguchi, Daisuke Morikawa, Takashi Saito, Kenji Tsuda, Masatomo Yashima

    Advanced Functional Materials   2023.4

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/adfm.202214082

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  • High Proton Conductivity in β‐Ba 2 ScAlO 5 Enabled by Octahedral and Intrinsically Oxygen‐Deficient Layers Reviewed

    Taito Murakami, Maxim Avdeev, Riho Morikawa, James R. Hester, Masatomo Yashima

    Advanced Functional Materials   33 ( 7 )   2206777 - 2206777   2022.12

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    Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    DOI： 10.1002/adfm.202206777

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    Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/adfm.202206777

  • High Oxide-Ion Conductivity in a Hexagonal Perovskite-Related Oxide Ba7Ta3.7Mo1.3O20.15 with Cation Site Preference and Interstitial Oxide Ions Reviewed

    Taito Murakami, Toshiya Shibata, Yuta Yasui, Kotaro Fujii, James R. Hester, Masatomo Yashima

    Small   18 ( 10 )   2022.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/smll.202106785

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  • High oxide-ion conductivity through the interstitial oxygen site in Ba7Nb4MoO20-based hexagonal perovskite related oxides Reviewed

    Masatomo Yashima, Takafumi Tsujiguchi, Yuichi Sakuda, Yuta Yasui, Yu Zhou, Kotaro Fujii, Shuki Torii, Takashi Kamiyama, Stephen J. Skinner

    Nature Communications   12 ( 1 )   2021.12

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s41467-020-20859-w

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  • Oxide-ion conduction in the Dion–Jacobson phase CsBi2Ti2NbO10−δ Reviewed

    Wenrui Zhang, Kotaro Fujii, Eiki Niwa, Masato Hagihala, Takashi Kamiyama, Masatomo Yashima

    Nature Communications   11 ( 1 )   2020.12

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    <title>Abstract</title>Oxide-ion conductors have found applications in various electrochemical devices, such as solid-oxide fuel cells, gas sensors, and separation membranes. Dion–Jacobson phases are known for their rich magnetic and electrical properties; however, there have been no reports on oxide-ion conduction in this family of materials. Here, for the first time to the best of our knowledge, we show the observation of fast oxygen anionic conducting behavior in CsBi2Ti2NbO10−<italic>δ</italic>. The bulk ionic conductivity of this Dion–Jacobson phase is 8.9 × 10−2 S cm−1 at 1073 K, a level that is higher than that of the conventional yttria-stabilized zirconia. The oxygen ion transport is attributable to the large anisotropic thermal motions of oxygen atoms, the presence of oxygen vacancies, and the formation of oxide-ion conducting layers in the crystal structure. The present finding of high oxide-ion conductivity in rare-earth-free CsBi2Ti2NbO10−<italic>δ</italic> suggests the potential of Dion–Jacobson phases as a platform to identify superior oxide-ion conductors.

    DOI： 10.1038/s41467-020-15043-z

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    Other Link： http://www.nature.com/articles/s41467-020-15043-z

  • High Proton Conductivity in Ba5Er2Al2ZrO13, a Hexagonal Perovskite-Related Oxide with Intrinsically Oxygen-Deficient Layers Reviewed

    Taito Murakami, James R. Hester, Masatomo Yashima

    Journal of the American Chemical Society   142 ( 27 )   11653 - 11657   2020.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/jacs.0c02403

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  • Structure of Ferroelectric Silver Niobate AgNbO3 Reviewed

    Masatomo Yashima, Shota Matsuyama, Rikiya Sano, Mitsuru Itoh, Kenji Tsuda, Desheng Fu

    CHEMISTRY OF MATERIALS   23 ( 7 )   1643 - 1645   2011.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/cm103389q

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  • Crystal Structure, Diffusion Path, and Oxygen Permeability of a Pr2NiO4-Based Mixed Conductor (Pr0.9La0.1)(2)(Ni0.74Cu0.21Ga0.05)O4+delta Reviewed

    Masatomo Yashima, Nuansaeng Sirikanda, Tatsumi Ishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   132 ( 7 )   2385 - 2392   2010.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/ja909820h

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  • Experimental visualization of lithium diffusion in LixFePO4 Reviewed

    Shin-ichi Nishimura, Genki Kobayashi, Kenji Ohoyama, Ryoji Kanno, Masatomo Yashima, Atsuo Yamada

    NATURE MATERIALS   7 ( 9 )   707 - 711   2008.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/nmat2251

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  • Structural disorder and diffusional pathway of oxide ions in a doped Pr2NiO4-based mixed conductor Reviewed

    Masatomo Yashima, Makiko Enoki, Takahiro Wakita, Roushown Ali, Yoshitaka Matsushita, Fujio Izumi, Tatsumi Ishihara

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   130 ( 9 )   2762 - +   2008.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/ja711478h

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  • Crystal structure and diffusion path in the fast lithium-ion conductor La0.62Li0.16TiO3

    M Yashima, M Itoh, Y Inaguma, Y Morii

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   127 ( 10 )   3491 - 3495   2005.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/ja0449224

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  • Crystal structure analysis of beta-tricalcium phosphate Ca-3(PO4)(2) by neutron powder diffraction

    M Yashima, A Sakai, T Kamiyama, A Hoshikawa

    JOURNAL OF SOLID STATE CHEMISTRY   175 ( 2 )   272 - 277   2003.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/S0022-4596(03)00279-2

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  • Ultraviolet 363.8-nm Raman spectroscopic system for in situ measurements at high temperatures

    Masatomo Yashima, Masato Kakihana, Ryosuke Shimidzu, Hirotaka Fujimori, Masahiro Yoshimura

    Applied Spectroscopy   51 ( 8 )   1224 - 1228   1997

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Society for Applied Spectroscopy  

    DOI： 10.1366/0003702971941791

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  • Metastable-stable phase diagrams in the zirconia-containing systems utilized in solid-oxide fuel cell application

    Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Solid State Ionics   86-88 ( 2 )   1131 - 1149   1996

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier  

    DOI： 10.1016/0167-2738(96)00386-4

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  • STRUCTURAL-CHANGES OF ZRO2-CEO2 SOLID-SOLUTIONS AROUND THE MONOCLINIC-TETRAGONAL PHASE-BOUNDARY Reviewed

    M YASHIMA, T HIROSE, S KATANO, Y SUZUKI, M KAKIHANA, M YOSHIMURA

    PHYSICAL REVIEW B   51 ( 13 )   8018 - 8025   1995.4

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  • Superprotonic Conduction in Donor Co‐Doped Perovskites

    Kensei Umeda, Kei Saito, Takashi Honda, Masatomo Yashima

    Angewandte Chemie International Edition   2026.1

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    Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    Abstract

    Donor doping of oxygen‐deficient BaScO 2.5 is an unexplored strategy for achieving high proton conductivity at intermediate temperatures of 200−400 °C. In this work, a new series of BaSc 1− x − y Mo x W y O 3− δ compounds was prepared via Mo/W donor co‐doping where x is the Mo content, y is the W content, and δ is the amount of oxygen vacancies. The present work reports the enhancement of proton conductivity by the Mo/W donor co‐doping of BaScO 2.5 . BaSc 0.8 Mo 0.1 W 0.1 O 2.8 exhibits exceptional proton conductivity—0.10 S cm − 1 at 315 °C and 0.01 S cm − 1 at 193 °C—alongside outstanding chemical stability in CO 2 , O 2 , and H 2 atmospheres. The high proton conductivity originates from the synergistic effects of abundant oxygen vacancies ( δ  = 0.2) and full hydration, yielding a high proton concentration, coupled with high proton diffusivity. The high diffusivity is attributable to the reduced proton trapping compared with acceptor and isovalent doping and overdoping due to higher proton concentration. In contrast to the acceptor co‐doping, the donor co‐doping does not increase the activation energy, resulting in lower activation energy and higher proton conductivity. These findings establish donor co‐doping into the oxygen‐deficient perovskites as a powerful design principle for next‐generation proton conductors with high proton conductivity at intermediate temperatures.

    DOI： 10.1002/anie.202521773

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    Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/anie.202521773

  • Proton conduction and full hydration of BaSc&lt;sub&gt;0.6&lt;/sub&gt;Lu&lt;sub&gt;0.2&lt;/sub&gt;Mo&lt;sub&gt;0.2&lt;/sub&gt;O&lt;sub&gt;2.8&lt;/sub&gt;

    Ryo Maeda, Kei Saito, Kotaro Fujii, Takashi Honda, Masatomo Yashima

    Journal of the Ceramic Society of Japan   133 ( 12 )   741 - 749   2025.12

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    Publishing type：Research paper (scientific journal)   Publisher：Ceramic Society of Japan  

    DOI： 10.2109/jcersj2.25094

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  • Orthorhombic (NH4,Li)Eu(MoO4)2 Solid Solution: Crystal Structure and Red-Emitting Photoluminescence

    Takuya Hasegawa, Suzuka Noda, Kotaro Fujii, Masatomo Yashima, Tomoyo Goto, Yasushi Sato, Ayahisa Okawa, Shu Yin

    Inorganic Chemistry   64 ( 34 )   17368 - 17378   2025.8

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/acs.inorgchem.5c02616

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  • Hydration-driven enhancement of interstitialcy oxide-ion diffusion

    Yuichi Sakuda, Mudasir A. Yatoo, Bhuvaneshwari Manivannan, Vediyappan Veeramani, Junko Habasaki, Stephen J. Skinner, Hiroshige Matsumoto, Masatomo Yashima

    Journal of Materials Chemistry A   13 ( 35 )   28955 - 28964   2025.7

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    Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    Hydration of an interstitial oxide-ion conductor enhances oxygen conductivity and diffusivity, as evidenced by water vapor and oxygen concentration cell, TG, conductivity, and tracer diffusion measurements and neural network MD simulations.

    DOI： 10.1039/d5ta04728e

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  • Effects of the anion exchange between I− and NCS− coordinated to Co2+-centered tetrahedra in the organic–inorganic hybrid halides

    Takuya Ohmi, Ryuju Ito, Sergey A. Nikolaev, Kotaro Fujii, Iain W. H. Oswald, Koki Matsushima, Yuiga Nakamura, James R. Neilson, Masatomo Yashima, Masaki Azuma, Takafumi Yamamoto

    Dalton Transactions   54 ( 27 )   10773 - 10780   2025.6

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    Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    (CH3NH3)2Co(NCS)4 and (CH3NH3)3CoI4(NCS) with isolated Co2+-centered tetrahedra were successfully synthesized. The effective magnetic moment and Curie constant decrease with the substitution of I− by NCS−.

    DOI： 10.1039/d5dt00924c

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  • High proton conductivity in Nb5+-doped BaScO2.5

    Kei Saito, Mitsuki Baba, Kensei Umeda, Kotaro Fujii, Takashi Honda, Masatomo Yashima

    Inorganic Chemistry Frontiers   2025.5

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    Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    We report high bulk proton conductivity (e.g., 0.01 S cm−1 at 320 °C) of pentavalent donor doped BaScO2.5, BaSc0.75Nb0.25O2.75, which is ascribed to high proton concentration and high proton diffusion coefficient due to the reduced proton trapping.

    DOI： 10.1039/d5qi00632e

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  • Solid-State 95Mo and 93Nb NMR Study of Ba7Nb4MoO20-Based Materials and Ba7Ta3.7Mo1.3O20.15

    Masataka Tansho, Atsushi Goto, Shinobu Ohki, Yuuki Mogami, Yuta Yasui, Yuichi Sakuda, Kotaro Fujii, Takahiro Iijima, Masatomo Yashima

    The Journal of Physical Chemistry C   128 ( 46 )   19679 - 19687   2024.11

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/acs.jpcc.4c02645

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  • A Novel Fast Proton Conductor Created by the Donor Doping into the Oxide with Intrinsic Oxygen Vacancies

    Kei Saito, Masatomo Yashima

    The Journal of Fuel Cell Technology   2024.4

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  • Structural Design of Oxide-Ion- and Proton-Conducting Layered Compounds

    Masatomo YASHIMA

    Denki Kagaku   92 ( 1 )   41 - 46   2024.3

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    Publishing type：Research paper (scientific journal)   Publisher：The Electrochemical Society of Japan  

    DOI： 10.5796/denkikagaku.24-fe0005

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  • Anionic Sublattices in Halide Solid Electrolytes: A Case Study with High‐Pressure Phase of Li3ScCl6

    Fenghua Ding, Atsunori Doi, Takafumi Ogawa, Hiroki Ubukata, Tong Zhu, Daichi Kato, Cédric Tassel, Itaru Oikawa, Naoki Inui, Satoru Kuze, Tsutomu Yamabayashi, Kotaro Fujii, Masatomo Yashima, Xing Ou, Zhijian Wang, Xiaobo Min, Koji Fujita, Hitoshi Takamura, Akihide Kuwabara, Tianren Zhang, Kent J. Griffith, Zhang Lin, Liyuan Chai, Hiroshi Kageyama

    Angewandte Chemie International Edition   2024.2

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    Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    The Li3MX6 compounds (M = Sc, Y, In; X = Cl, Br) are known as promising ionic conductors due to their compatibility with typical metal oxide cathode materials. In this study, we have successfully synthesized γ‐Li3ScCl6 using high pressure for the first time in this family. Structural analysis revealed that the high‐pressure polymorph crystallizes in the polar and chiral space group P63mc with hexagonal close‐packing (hcp) of anions, unlike the ambient‐pressure a‐Li3ScCl6 and its spinel analog with cubic closed packing (ccp) of anions. Investigation of the known Li3MX6 family further revealed that the cation/anion radius ratio, rM/rX, is the factor that determines which anion sublattice is formed and that in γ‐Li3ScCl6, the difference in compressibility between Sc and Cl exceeds the rM/rX threshold under pressure, enabling the ccp‐to‐hcp conversion. Electrochemical tests of γ‐Li3ScCl6 demonstrate improved electrochemical reduction stability. These findings open up new avenues and design principles for lithium solid electrolytes, enabling routes for materials exploration and tuning electrochemical stability without compositional changes or the use of coatings.

    DOI： 10.1002/anie.202401779

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  • Strongly Enhanced Polarization in a Ferroelectric Crystal by Conduction-Proton Flow

    Junichi Yanagisawa, Takuya Aoyama, Kotaro Fujii, Masatomo Yashima, Yoshiyuki Inaguma, Akihide Kuwabara, Kazuki Shitara, Benjamin Le Ouay, Shinya Hayami, Masaaki Ohba, Ryo Ohtani

    Journal of the American Chemical Society   146 ( 2 )   1476 - 1483   2024.1

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/jacs.3c10841

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  • High proton conduction by full hydration in highly oxygen deficient perovskite

    Kei Saito, Kensei Umeda, Kotaro Fujii, Kazuhiro Mori, Masatomo Yashima

    Journal of Materials Chemistry A   2024

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    Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    We report high proton conductivity (10 mS cm−1 at 235 °C) of stable BaSc0.8W0.2O2.8, which is attributed to (1) high proton concentration due to full hydration and large amount of oxygen vacancies and (2) high proton mobility due to reduced proton trapping.

    DOI： 10.1039/d4ta01978d

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  • Synthesis, crystal structure and investigation of ion-exchange possibility for sodium tellurate NaTeO3(OH)

    Tsubasa Ishii, Yue Jin Shan, Kotaro Fujii, Tetsuhiro Katsumata, Hideo Imoto, Ariunaa Baterdene, Keitaro Tezuka, Masatomo Yashima

    Dalton Transactions   2024

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    Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    Unusual crystal structure of new sodium tellurate NaTeO3(OH) synthesized by hydrothermal synthesis.

    DOI： 10.1039/d4dt00165f

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  • Dimer-Mediated Cooperative Mechanism of Ultrafast-Ion Conduction in Hexagonal Perovskite-Related Oxides

    Yuichi Sakuda, Taito Murakami, Maxim Avdeev, Kotaro Fujii, Yuta Yasui, James R. Hester, Masato Hagihala, Yoichi Ikeda, Yusuke Nambu, Masatomo Yashima

    Chemistry of Materials   2023.11

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/acs.chemmater.3c02378

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  • Structural and electrical properties of Bi3GaSb2O11 at high temperatures

    Kohei Matsuzaki, Wenrui Zhang, Kei Saito, Kotaro Fujii, Masatomo Yashima

    Journal of Solid State Chemistry   124380 - 124380   2023.10

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.jssc.2023.124380

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  • Structure Analysis and Luminescence Properties of Red-emitting Iodide Scintillators with Potassium-hexachloroplatinate(IV) Type Structure

    Shohei Kodama, Shunsuke Kurosawa, Kotaro Fujii, Masatomo Yashima, Akihiro Yamaji, Akira Yoshikawa

    Journal of Alloys and Compounds   172506 - 172506   2023.10

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.jallcom.2023.172506

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  • Synthesis and ionic conductivity of an argyrodite-type Li6SbS5I electrolyte

    Takuya Kimura, Ryo Izawa, Chie Hotehama, Kotaro Fujii, Atsushi Sakuda, Masatomo Yashima, Masahiro Tatsumisago, Akitoshi Hayashi

    Solid State Ionics   399   116287 - 116287   2023.10

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.ssi.2023.116287

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  • Thiocyanate-Stabilized Pseudo-cubic Perovskite CH(NH2)2PbI3 from Coincident Columnar Defect Lattices

    Takuya Ohmi, Iain W. H. Oswald, James R. Neilson, Nikolaj Roth, Shunta Nishioka, Kazuhiko Maeda, Kotaro Fujii, Masatomo Yashima, Masaki Azuma, Takafumi Yamamoto

    Journal of the American Chemical Society   145 ( 36 )   19759 - 19767   2023.8

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/jacs.3c05390

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  • La4Ga2S8O3: A Rare-Earth Gallium Oxysulfide with Disulfide Ions

    Hong Yan, Kotaro Fujii, Houria Kabbour, Akira Chikamatsu, Yu Meng, Yoshitaka Matsushita, Masatomo Yashima, Kazunari Yamaura, Yoshihiro Tsujimoto

    Inorganic Chemistry   62 ( 26 )   10481 - 10489   2023.6

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/acs.inorgchem.3c01524

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  • Improved Oxide Ion Conductivity of Hexagonal Perovskite-Related Oxides Ba3W1+xV1−xO8.5+x/2

    Yugo Kikuchi, Yuta Yasui, James R. Hester, Masatomo Yashima

    Inorganics   11 ( 6 )   238 - 238   2023.5

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    Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

    Hexagonal perovskite-related oxides such as Ba3WVO8.5 have attracted much attention due to their unique crystal structures and significant oxide ion conduction. However, the oxide ion conductivity of Ba3WVO8.5 is not very high. Herein, we report new hexagonal perovskite-related oxides Ba3W1+xV1−xO8.5+x/2 (x = −0.1, −0.05, 0.05, 0.1, 0.25, 0.4, 0.5, 0.6, and 0.75). The bulk conductivity of Ba3W1.6V0.4O8.8 was found to be 21 times higher than that of the mother material Ba3WVO8.5 at 500 °C. Maximum entropy method (MEM) neutron scattering length density (NSLD) analyses of neutron diffraction data at 800 °C experimentally visualized the oxide ion diffusion pathways through the octahedral O2 and tetrahedral O3 sites in intrinsically oxygen-deficient layers. By increasing the excess W content x in Ba3W1+xV1−xO8.5+x/2, the excess oxygen content x/2 increases, which leads to more oxygen atoms at the O2 and O3 oxygen sites, a higher minimum NSLD on the O2–O3 path, and a higher level of conductivity. Another reason for the increased conductivity of Ba3W1.6V0.4O8.8 is the lower activation energy for oxide ion conduction, which can be ascribed to the longer (W/V)–O2 and (W/V)–O3 distances due to the substitution of V atoms with large-sized W species. The present findings open new avenues in the science and technology of oxide ion conductors.

    DOI： 10.3390/inorganics11060238

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  • Supramolecular multi-electron redox photosensitisers comprising a ring-shaped Re(<scp>i</scp>) tetranuclear complex and a polyoxometalate Reviewed

    Maria Takahashi, Tsuyoshi Asatani, Tatsuki Morimoto, Yoshinobu Kamakura, Kotaro Fujii, Masatomo Yashima, Naoki Hosokawa, Yusuke Tamaki, Osamu Ishitani

    Chemical Science   2023

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    Supramolecular photosensitisers comprising a ring-shaped Re(i) tetranuclear complex and a Keggin-type heteropolyoxometalate were synthesised. They can photochemically accumulate four electrons and supply them for the photocatalytic CO2 reduction.

    DOI： 10.1039/d2sc04252e

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  • Recent developments in oxide ion conductors: focusing on Dion–Jacobson phases Reviewed

    Wenrui Zhang, Masatomo Yashima

    Chemical Communications   59 ( 2 )   134 - 152   2023

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    We present recent developments in oxide ion conductors focusing on Dion–Jacobson phases, and demonstrate how the information gleaned from these studies can be applied to the design of novel oxide-ion conductors.

    DOI： 10.1039/d2cc05288a

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  • Bi12O17Cl2 with a Sextuple Bi-O Layer Composed of Rock-Salt and Fluorite Units and its Structural Conversion through Fluorination to Enhance Photocatalytic Activity Reviewed

    Daichi Kato, Osamu Tomita, Ryky Nelson, Maria A. Kirsanova, Richard Dronskowski, Hajime Suzuki, Chengchao Zhong, Cedric Tassel, Kohdai Ishida, Yosuke Matsuzaki, Craig M. Brown, Koji Fujita, Kotaro Fujii, Masatomo Yashima, Yoji Kobayashi, Akinori Saeki, Itaru Oikawa, Hitoshi Takamura, Ryu Abe, Hiroshi Kageyama, Tatiana E. Gorelik, Artem M. Abakumov

    ADVANCED FUNCTIONAL MATERIALS   32 ( 41 )   2022.10

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    DOI： 10.1002/adfm.202204112

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  • Different Local Structures of Mo and Nb Polyhedra in the Oxide-Ion-Conducting Hexagonal Perovskite-Related Oxide Ba3MoNbO8.5 Revealed by 95Mo and 93Nb NMR Measurements Reviewed

    Masataka Tansho, Atsushi Goto, Shinobu Ohki, Yuuki Mogami, Yuichi Sakuda, Yuta Yasui, Taito Murakami, Kotaro Fujii, Takahiro Iijima, Masatomo Yashima

    The Journal of Physical Chemistry C   126 ( 31 )   13284 - 13290   2022.8

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    DOI： 10.1021/acs.jpcc.2c03429

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  • Ge-Containing Oxide-Ion Conductors with CaEu2Ge3O10-Type Structure Discovered by the Bond-Valence Method and Experiments Reviewed

    Masahiro Matsui, Kotaro Fujii, Masahiro Shiraiwa, Masatomo Yashima

    Inorganic Chemistry   61 ( 31 )   12327 - 12336   2022.7

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    DOI： 10.1021/acs.inorgchem.2c01662

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  • Highly Electron-Doped TaON Single-Crystal Growth by a High-Pressure Flux Method Reviewed

    Kohdai Ishida, Cédric Tassel, Daichi Kato, Hiroki Ubukata, Kantaro Murayama, Taito Murakami, Masatomo Yashima, Yuji Higo, Yoshinori Tange, W. Adam Phelan, Tyrel M. McQueen, Hiroshi Kageyama

    Inorganic chemistry   61 ( 29 )   11118 - 11123   2022.7

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    DOI： 10.1021/acs.inorgchem.2c00897

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  • Improved oxide-ion and lower proton conduction of hexagonal perovskite-related oxides based on Ba7Nb4MoO20 by Cr6+ doping Reviewed

    Yuichi Sakuda, James R. Hester, Masatomo Yashima

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   130 ( 7 )   442 - 447   2022.7

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    DOI： 10.2109/jcersj2.21192

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  • Improved oxide-ion conductivity by substitution of Sr for Bi in Dion-Jacobson phase CsBi2Ti2NbO10 Reviewed

    Wenrui Zhang, Masatomo Yashima

    Ceramics International   48 ( 12 )   16522 - 16528   2022.6

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    DOI： 10.1016/j.ceramint.2022.02.059

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  • Simultaneous Reduction of Proton Conductivity and Enhancement of Oxide-Ion Conductivity by Aliovalent Doping in Ba7Nb4MoO20 Reviewed

    Yuki Suzuki, Taito Murakami, Kotaro Fujii, James R Hester, Yuta Yasui, Masatomo Yashima

    Inorganic Chemistry   61 ( 19 )   7537 - 7545   2022.5

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  • Synthesis of Hydride-Doped Perovskite Stannate with Visible Light Absorption Capability Reviewed

    Masashi Nakamura, Hirofumi Akamatsu, Kotaro Fujii, Yusuke Nambu, Yoichi Ikeda, Tomoki Kanazawa, Shunsuke Nozawa, Masatomo Yashima, Katsuro Hayashi, Kazuhiko Maeda

    Inorganic Chemistry   61 ( 17 )   6584 - 6593   2022.4

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    DOI： 10.1021/acs.inorgchem.2c00398

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  • First-Principles Analysis of the Oxide-Ion Conduction Mechanism in Si-Deficient Lanthanum Silicate Apatite Reviewed

    Yusuke Ogura, Tatsuya Yokoi, Kotaro Fujii, Masatomo Yashima, Katsuyuki Matsunaga

    Journal of Physical Chemistry C   126 ( 13 )   5805 - 5812   2022.4

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    DOI： 10.1021/acs.jpcc.1c10486

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  • イオン伝導経路の実験による可視化と新型イオン伝導体の探索 Reviewed

    八島正知

    電気化学   90 ( 1 )   10 - 15   2022.3

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  • Oxide-Ion Occupational Disorder, Diffusion Path, and Conductivity in Hexagonal Perovskite Derivatives Ba3WNbO8.5 and Ba3MoNbO8.5 Reviewed

    Yuta Yasui, Takafumi Tsujiguchi, Yuichi Sakuda, James R. Hester, Masatomo Yashima

    Journal of Physical Chemistry C   126 ( 5 )   2383 - 2393   2022.2

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    DOI： 10.1021/acs.jpcc.1c09416

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  • Oxide-ion and proton conductivity of the ordered perovskite BaY1/3Ga2/3O2.5 Reviewed

    Kei Saito, Kotaro Fujii, Masatomo Yashima

    Journal of Solid State Chemistry   306   2022.2

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    DOI： 10.1016/j.jssc.2021.122733

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  • Ruddlesden-Popper Oxychlorides Ba3Y2O5Cl2, Sr3Sc2O5Cl2, and Sr2ScO3Cl: First Examples of Oxide-Ion-Conducting Oxychlorides Reviewed

    Hiroshi Yaguchi, Kotaro Fujii, Yoshinori Tsuchiya, Hiraku Ogino, Yoshihiro Tsujimoto, Masatomo Yashima

    ACS Applied Energy Materials   5 ( 1 )   295 - 304   2022.1

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    DOI： 10.1021/acsaem.1c02828

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  • Na+diffusion mechanism and transition metal substitution in tunnel-type manganese-based oxides for Na-ion rechargeable batteries Reviewed

    Irene Quinzeni, Kotaro Fujii, Marcella Bini, Masatomo Yashima, Cristina Tealdi

    Materials Advances   3 ( 2 )   986 - 997   2022.1

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    DOI： 10.1039/d1ma00901j

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  • Effect of La vacancies on the oxide-ion conduction in lanthanum silicate apatites Reviewed

    Yusuke Ogura, Tatsuya Yokoi, Kotaro Fujii, Masatomo Yashima, Katsuyuki Matsunaga

    Solid State Ionics   373   2021.12

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    DOI： 10.1016/j.ssi.2021.115793

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  • Mixed alkali-ion transport and storage in atomic-disordered honeycomb layered NaKNi2TeO6 Reviewed

    Titus Masese, Yoshinobu Miyazaki, Josef Rizell, Godwill Mbiti Kanyolo, Chih Yao Chen, Hiroki Ubukata, Keigo Kubota, Kartik Sau, Tamio Ikeshoji, Zhen Dong Huang, Kazuki Yoshii, Teruo Takahashi, Miyu Ito, Hiroshi Senoh, Jinkwang Hwang, Abbas Alshehabi, Kazuhiko Matsumoto, Toshiyuki Matsunaga, Kotaro Fujii, Masatomo Yashima, Masahiro Shikano, Cédric Tassel, Hiroshi Kageyama, Yoshiharu Uchimoto, Rika Hagiwara, Tomohiro Saito

    Nature Communications   12 ( 1 )   2021.12

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    DOI： 10.1038/s41467-021-24694-5

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  • Hydride-based antiperovskites with soft anionic sublattices as fast alkali ionic conductors Reviewed

    Shenghan Gao, Thibault Broux, Susumu Fujii, Cédric Tassel, Kentaro Yamamoto, Yao Xiao, Itaru Oikawa, Hitoshi Takamura, Hiroki Ubukata, Yuki Watanabe, Kotaro Fujii, Masatomo Yashima, Akihide Kuwabara, Yoshiharu Uchimoto, Hiroshi Kageyama

    Nature Communications   12 ( 1 )   2021.12

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    <title>Abstract</title>Most solid-state materials are composed of p-block anions, only in recent years the introduction of hydride anions (1s2) in oxides (e.g., SrVO2H, BaTi(O,H)3) has allowed the discovery of various interesting properties. Here we exploit the large polarizability of hydride anions (H–) together with chalcogenide (Ch2–) anions to construct a family of antiperovskites with soft anionic sublattices. The M3HCh antiperovskites (M = Li, Na) adopt the ideal cubic structure except orthorhombic Na3HS, despite the large variation in sizes of M and Ch. This unconventional robustness of cubic phase mainly originates from the large size-flexibility of the H– anion. Theoretical and experimental studies reveal low migration barriers for Li+/Na+ transport and high ionic conductivity, possibly promoted by a soft phonon mode associated with the rotational motion of HM6 octahedra in their cubic forms. Aliovalent substitution to create vacancies has further enhanced ionic conductivities of this series of antiperovskites, resulting in Na2.9H(Se0.9I0.1) achieving a high conductivity of ~1 × 10–4 S/cm (100 °C).

    DOI： 10.1038/s41467-020-20370-2

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  • Site-Selective Eu3+Luminescence in the Monoclinic Phase of YSiO2N Reviewed

    Yuuki Kitagawa, Jumpei Ueda, Kotaro Fujii, Masatomo Yashima, Shiro Funahashi, Takayuki Nakanishi, Takashi Takeda, Naoto Hirosaki, Kenta Hongo, Ryo Maezono, Setsuhisa Tanabe

    Chemistry of Materials   33 ( 22 )   8873 - 8885   2021.11

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    DOI： 10.1021/acs.chemmater.1c03139

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  • Experimental Visualization of the Interstitialcy Diffusion of Anions in the LaOF-Based Oxyfluoride La0.9Sr0.1O0.45F2 Reviewed

    Keisuke Hibino, Mahiro Tanaka, Satoshi Kozakai, Kotaro Fujii, Tatsumi Ishihara, James R. Hester, Masatomo Yashima

    ACS Applied Energy Materials   4 ( 9 )   8891 - 8900   2021.9

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    DOI： 10.1021/acsaem.1c01097

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  • Electrochemical Crystal Growth of Titanium Oxyfluorides—A Strategy for Development of Electron-Doped Materials Reviewed

    Yusuke Chiba, Kengo Shibata, Hiroshi Takatsu, Kotaro Fujii, Miwa Saito, Hiroshi Kageyama, Kazuhiko Maeda, Masatomo Yashima, Teruki Motohashi

    Inorganic Chemistry   2021.8

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    DOI： 10.1021/acs.inorgchem.1c01640

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  • Kinetically Stabilized Cation Arrangement in Li 3 YCl 6 Superionic Conductor during Solid‐State Reaction Reviewed

    Hiroaki Ito, Kazuki Shitara, Yongming Wang, Kotaro Fujii, Masatomo Yashima, Yosuke Goto, Chikako Moriyoshi, Nataly Carolina Rosero‐Navarro, Akira Miura, Kiyoharu Tadanaga

    Advanced Science   8 ( 15 )   2101413 - 2101413   2021.8

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    DOI： 10.1002/advs.202101413

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  • Sn-Based Perovskite with a Wide Visible-Light Absorption Band Assisted by Hydride Doping Reviewed

    Masashi Nakamura, Hiroshi Watanabe, Hirofumi Akamatsu, Kotaro Fujii, Masatomo Yashima, George Hasegawa, Miki Inada, Katsuro Hayashi, Kazuhiko Maeda

    CHEMISTRY OF MATERIALS   33 ( 10 )   3631 - 3638   2021.5

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    DOI： 10.1021/acs.chemmater.1c00460

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  • High-temperature proton conductors based on the (110) layered perovskite BaNdScO4 Reviewed

    Masahiro Shiraiwa, Takafusa Kido, Kotaro Fujii, Masatomo Yashima

    Journal of Materials Chemistry A   9 ( 13 )   8607 - 8619   2021.4

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    DOI： 10.1039/d0ta11573h

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  • Ternary carbodiimide compound, Ba0.9Sr0.1NCN with distorted rutile-type structure Reviewed

    Yuji Masubuchi, Suzuka Miyazaki, Kotaro Fujii, Masatomo Yashima, Akira Miura, Mikio Higuchi

    Journal of Solid State Chemistry   296   122000 - 122000   2021.4

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    DOI： 10.1016/j.jssc.2021.122000

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  • Protonic Conduction in the BaNdInO4Structure Achieved by Acceptor Doping Reviewed

    Yu Zhou, Masahiro Shiraiwa, Masanori Nagao, Kotaro Fujii, Isao Tanaka, Masatomo Yashima, Laura Baque, Juan F. Basbus, Liliana V. Mogni, Stephen J. Skinner

    Chemistry of Materials   33 ( 6 )   2139 - 2146   2021.3

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    DOI： 10.1021/acs.chemmater.0c04828

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  • A High Proton Conductor without Chemical Substitutions Reviewed

    MURAKAMI Taito, YASHIMA Masatomo

    Nihon Kessho Gakkaishi   63 ( 3 )   177 - 178   2021

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    DOI： 10.5940/jcrsj.63.177

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  • Ionic conduction mechanism in Ca-doped lanthanum oxychloride Reviewed

    Kazuki Shitara, Akihide Kuwabara, Keisuke Hibino, Kotaro Fujii, Masatomo Yashima, James R. Hester, Masanori Umeda, Naoyoshi Nunotani, Nobuhito Imanaka

    Dalton Transactions   50 ( 1 )   151 - 156   2021

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    <p>The mechanism of ionic conduction in Ca-doped lanthanum oxychloride (LaOCl) was investigated using first-principles calculations based on density functional theory.</p>

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  • Preparation and thermal stability of oxynitride perovskite solid solution Sr1-La Ta1-Ti O2N Reviewed

    Yuji Masubuchi, Sota Ohtaki, Kotaro Fujii, Masatomo Yashima, Mikio Higuchi, Shinichi Kikkawa

    Journal of the European Ceramic Society   40 ( 16 )   6288 - 6292   2020.12

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    DOI： 10.1016/j.jeurceramsoc.2019.10.004

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  • Strain-induced creation and switching of anion vacancy layers in perovskite oxynitrides Reviewed

    Takafumi Yamamoto, Akira Chikamatsu, Shunsaku Kitagawa, Nana Izumo, Shunsuke Yamashita, Hiroshi Takatsu, Masayuki Ochi, Takahiro Maruyama, Morito Namba, Wenhao Sun, Takahide Nakashima, Fumitaka Takeiri, Kotaro Fujii, Masatomo Yashima, Yuki Sugisawa, Masahito Sano, Yasushi Hirose, Daiichiro Sekiba, Craig M. Brown, Takashi Honda, Kazutaka Ikeda, Toshiya Otomo, Kazuhiko Kuroki, Kenji Ishida, Takao Mori, Koji Kimoto, Tetsuya Hasegawa, Hiroshi Kageyama

    Nature Communications   11 ( 1 )   1 - 8   2020.12

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    <title>Abstract</title>Perovskite oxides can host various anion-vacancy orders, which greatly change their properties, but the order pattern is still difficult to manipulate. Separately, lattice strain between thin film oxides and a substrate induces improved functions and novel states of matter, while little attention has been paid to changes in chemical composition. Here we combine these two aspects to achieve strain-induced creation and switching of anion-vacancy patterns in perovskite films. Epitaxial SrVO3 films are topochemically converted to anion-deficient oxynitrides by ammonia treatment, where the direction or periodicity of defect planes is altered depending on the substrate employed, unlike the known change in crystal orientation. First-principles calculations verified its biaxial strain effect. Like oxide heterostructures, the oxynitride has a superlattice of insulating and metallic blocks. Given the abundance of perovskite families, this study provides new opportunities to design superlattices by chemically modifying simple perovskite oxides with tunable anion-vacancy patterns through epitaxial lattice strain.

    DOI： 10.1038/s41467-020-19217-7

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  • Synthesis and Photoluminescence Properties of Rare-Earth-Activated Sr3–xAxAlO4H (A = Ca, Ba; x = 0, 1): New Members of Aluminate Oxyhydrides Reviewed

    Tong Wu, Kotaro Fujii, Taito Murakami, Masatomo Yashima, Satoru Matsuishi

    Inorganic Chemistry   59 ( 20 )   15384 - 15393   2020.10

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    DOI： 10.1021/acs.inorgchem.0c02356

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  • Synthesis of Three-Layer Perovskite Oxynitride K2Ca2Ta3O9N·2H2O and Photocatalytic Activity for H2 Evolution under Visible Light Reviewed

    Ya Tang, Kosaku Kato, Takayoshi Oshima, Hiroto Mogi, Akinobu Miyoshi, Kotaro Fujii, Kei-ichi Yanagisawa, Koji Kimoto, Akira Yamakata, Masatomo Yashima, Kazuhiko Maeda

    Inorganic Chemistry   59 ( 15 )   11122 - 11128   2020.8

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    DOI： 10.1021/acs.inorgchem.0c01607

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  • Single-crystal growth, structure and luminescence properties of Cs2HfCl3Br3 Reviewed

    Shohei Kodama, Shunsuke Kurosawa, Kotaro Fujii, Taito Murakami, Masatomo Yashima, Jan Pejchal, Robert Král, Martin Nikl, Akihiro Yamaji, Masao Yoshino, Satoshi Toyoda, Hiroki Sato, Yuji Ohashi, Kei Kamada, Yuui Yokota, Akira Yoshikawa

    Optical Materials   106   2020.8

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    DOI： 10.1016/j.optmat.2020.109942

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  • Responsive four‐coordinate Fe(II) nodes in FePd(CN)4 Reviewed

    Ryo Ohtani, Hiromu Matsunari, Takafumi Yamamoto, Koji Kimoto, Masaaki Isobe, Kotaro Fujii, Masatomo Yashima, Susumu Fujii, Akihide Kuwabara, Yuh Hijikata, Shin-ichiro Noro, Masaaki Ohba, Hiroshi Kageyama, Shinya Hayami

    Angewandte Chemie International Edition   59 ( 43 )   19254 - 19259   2020.7

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    DOI： 10.1002/anie.202008187

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  • High Catalytic Activity of Crystalline Lithium Calcium Silicate for Oxidative Coupling of Methane Originated from Crystallographic Joint Effects of Multiple Cations Reviewed

    Tomohiro Matsumoto, Miwa Saito, Satoshi Ishikawa, Kotaro Fujii, Masatomo Yashima, Wataru Ueda, Teruki Motohashi

    ChemCatChem   12 ( 7 )   1968 - 1972   2020.4

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    DOI： 10.1002/cctc.201902241

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  • Two-Dimensional Perovskite Oxynitride K2LaTa2O6N with an H+/K+ Exchangeability in Aqueous Solution to Form Stable Photocatalyst for Visible-Light H2 Evolution Reviewed International journal

    Takayoshi Oshima, Tom Ichibha, Kenji Oqmhula, Keisuke Hibino, Hiroto Mogi, Shunsuke Yamashita, Kotaro Fujii, Yugo Miseki, Kenta Hongo, Daling Lu, Ryo Maezono, Kazuhiro Sayama, Masatomo Yashima, Koji Kimoto, Hideki Kato, Masato Kakihana, Hiroshi Kageyama, Kazuhiko Maeda

    Angew. Chem., Int. Ed.   59 ( 24 )   9736 - 9743   2020.1

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    Undoped layered oxynitrides have not been considered as promising H2 -evolution photocatalysts because of the low chemical stability of oxynitrides in aqueous solution. Here, we demonstrate the synthesis of a new layered perovskite oxynitride, K2 LaTa2 O6 N, as an exceptional example of a water-tolerant photocatalyst for H2 evolution under visible light. The material underwent in-situ H+ /K+ exchange in aqueous solution while keeping its visible-light-absorption capability. Protonated K2 LaTa2 O6 N, modified with an Ir cocatalyst, exhibited excellent catalytic activity toward H2 evolution in the presence of I- as an electron donor and under visible light; the activity was six times higher than Pt/ZrO2 /TaON, one of the best-performing oxynitride photocatalysts for H2 evolution. Overall water splitting was also achieved using the Ir-loaded, protonated K2 LaTa2 O6 N in combination with Cs-modified Pt/WO3 as an O2 evolution photocatalyst in the presence of an I3- /I- shuttle redox couple.

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  • A new structure family of oxide-ion conductors based on BaGdInO4 Reviewed

    Hiroshi Yaguchi, Kotaro Fujii, Masatomo Yashima

    Journal of Materials Chemistry A   8 ( 17 )   8638 - 8647   2020

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    <p>We prepared new materials BaGdInO4 and BaGd0.9<italic>A</italic>0.1InO3.95 (<italic>A</italic> = Mg, Ca, Sr) for the first time. These oxides belong to a new structure family of one-dimensional oxide-ion conductors and exhibit conductivities comparable to BaNdInO4-based oxides.</p>

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  • Cation- and anion-ordered rutile-type derivative LiTeO3(OH) Reviewed

    Kotaro Fujii, Yume Yoshida, Yue Jin Shan, Keitaro Tezuka, Yoshiyuki Inaguma, Masatomo Yashima

    Chemical Communications   56 ( 69 )   10042 - 10045   2020

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    DOI： 10.1039/d0cc04074f

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  • Synthesis, structure, and luminescence properties of layered oxychloride Ba3Y2O5Cl2

    Yuki Iwasa, Yu Su, Yoshinori Tsuchiya, Makoto Tatsuda, Kohji Kishio, Takayuki Yanagida, Fumi Takada, Taichiro Nishio, Yoshihiro Tsujimoto, Kotaro Fujii, Masatomo Yashima, Hiraku Ogino

    Journal of Materials Chemistry C   2020

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    DOI： 10.1039/D0TC04415F

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  • Dion–Jacobson-type oxide-ion conductor CsLa2Ti2NbO10−δ without phase transitions

    Wenrui Zhang, Kotaro Fujii, Tomohiro Ishiyama, Harue Kandabashi, Masatomo Yashima

    Journal of Materials Chemistry A   2020

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    DOI： 10.1039/D0TA06135B

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  • Polymorphism and Temperature-Induced Phase Transitions of Na2CoP2O7 Reviewed

    Maxim Avdeev, Chin-Wei Wang, Prabeer Barpanda, Kotaro Fujii, Masatomo Yashima

    Inorganic Chemistry   58 ( 24 )   16823 - 16830   2019.12

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    DOI： 10.1021/acs.inorgchem.9b03014

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  • Experimental Visualization of Interstitialcy Diffusion of Li Ion in β-Li<inf>2</inf>TiO<inf>3</inf> Reviewed

    Keisuke Mukai, Masatomo Yashima, Keisuke Hibino, Takayuki Terai

    ACS Applied Energy Materials   2 ( 8 )   5481 - 5489   2019.8

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    DOI： 10.1021/acsaem.9b00639

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  • Stepwise topochemical fluorination of SrCrO3 perovskite via a super-structured oxide Reviewed

    Su Yu, Tsujimoto Yoshihiro, Fujii Kotaro, Masubuchi Yuji, Ohata Hirohito, Iwai Hideo, Yashima Masatomo, Yamaura Kazunari

    CHEMICAL COMMUNICATIONS   55 ( 50 )   7239 - 7242   2019.6

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    DOI： 10.1039/c9cc02512j

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  • Discovery of a Rare-Earth-Free Oxide-Ion Conductor Ca3Ga4O9 by Screening through the Bond-Valence-Based-Energy Calculations, Synthesis and the Characterization of the Structural and Transport Properties Reviewed

    Yuta Yasui, Eiki Niwa, Masahiro Matsui, Kotaro Fujii, Masatomo Yashima

    Inorganic Chemistry   58 ( 14 )   9460 - 9468   2019.6

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    DOI： 10.1021/acs.inorgchem.9b01300

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  • Synthesis of Ba1-x SrxYSi2O5N and Discussion based on Structure Analysis and DFT Calculation Reviewed

    Takuya Yasunaga, Makoto Kobayashi, Kenta Hongo, Kotaro Fujii, Shunsuke Yamamoto, Ryo Maezono, Masatomo Yashima, Masaya Mitsuishi, Hideki Kato, Masato Kakihana

    J. Sold State Chem.   276   266 - 271   2019.5

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  • Direct evidence for two-dimensional oxide-ion diffusion in the hexagonal perovskite-related oxide Ba3MoNbO8.5–δ Reviewed

    Masatomo Yashima, Takafumi Tsujiguchi, Kotaro Fujii, Eiki Niwa, Shunta Nishioka, James R. Hester, Kazuhiko Maeda

    Journal of Material Chemistry A   7 ( 23 )   13910 - 13916   2019.5

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    DOI： 10.1039/C9TA03588E

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  • Retraction notice to “Thermodynamics of the CO2 absorption in BaCeO3 and SrCeO3 using thermogravimetric and differential thermal analyses” (Materials Research Bulletin (2019) 109 (213–221), (S0025540818301521) (10.1016/j.materresbull.2018.06.033))

    Eiki Niwa, Kaori Kondo, Masatake Aoki, Ryuhei Sato, Ryo Yoshizawa, Fumito Fujishiro, Masatomo Yashima, Takuya Hashimoto

    Materials Research Bulletin   112   445   2019.4

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    DOI： 10.1016/j.materresbull.2019.01.012

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  • Synthesis of a Layered Niobium Oxynitride Rb2NdNb2O6N·H2O Showing Visible-Light Photocatalytic Activity for H2 Evolution Reviewed

    Haruki Wakayama, Keisuke Hibino, Kotaro Fujii, Takayoshi Oshima, Keiichi Yanagisawa, Yuuga Kobayashi, Koji Kimoto, Masatomo Yashima, Kazuhiko Maeda

    Inorganic Chemistry   58 ( 9 )   6161 - 6166   2019.4

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  • Crystal structures of Ca4+x Y3-x Si7O15+x N5-x (0 ≤ x ≤ 1) comprising of an isolated [Si7(O,N)19] unit. Reviewed International journal

    Makoto Kobayashi, Takuya Yasunaga, Hideki Kato, Kotaro Fujii, Masatomo Yashima, Masato Kakihana

    Acta crystallographica. Section E, Crystallographic communications   75 ( Pt 2 )   260 - 263   2019.2

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    DOI： 10.1107/S2056989019001257

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  • Thermodynamics of the CO 2 absorption in BaCeO 3 and SrCeO 3 using thermogravimetric and differential thermal analyses

    Eiki Niwa, Kaori Kondo, Masatake Aoki, Ryuhei Sato, Ryo Yoshizawa, Fumito Fujishiro, Masatomo Yashima, Takuya Hashimoto

    Materials Research Bulletin   109   213 - 221   2019.1

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    DOI： 10.1016/j.materresbull.2018.06.033

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  • Thermal expansion and P-V-T equation of state of cubic silicon nitride

    Norimasa Nishiyama, Kotaro Fujii, Eleonora Kulik, Masahiro Shiraiwa, Nico A. Gaida, Yuji Higo, Yoshinori Tange, Astrid Holzheid, Masatomo Yashima, Fumihiro Wakai

    Journal of the European Ceramic Society   39 ( 13 )   3627 - 3633   2019.1

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    DOI： 10.1016/j.jeurceramsoc.2019.05.003

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  • Crystal structure analysis and evidence of mixed anion coordination at the Ce 3+ site in Y 3 Al 2 (Al,Si) 3 (O,N) 12 oxynitride garnet phosphor Reviewed

    Kazuki Asami, Masahiro Shiraiwa, Jumpei Ueda, Kotaro Fujii, Kenta Hongo, Ryo Maezono, Mikhail G. Brik, Masatomo Yashima, Setsuhisa Tanabe

    Journal of Materials Chemistry C   7 ( 5 )   1330 - 1336   2019

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    DOI： 10.1039/c8tc04980g

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  • Structural Analysis of Mixed Anion Compounds Reviewed

    Masatomo YASHIMA, Katsuro HAYASHI, Koji KIMOTO

    日本結晶学会誌   60 ( 5-6 )   254 - 259   2018.12

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  • Ce4+-Based Compounds Capable of Photoluminescence by Charge Transfer Excitation under Near-Ultraviolet–Visible Light Reviewed

    Dawei Wen, Hideki Kato, Makoto Kobayashi, Shunsuke Yamamoto, Masaya Mitsuishi, Kotaro Fujii, Masatomo Yashima, Masato Kakihana

    Inorg. Chem.   57 ( 23 )   14524 - 14531   2018.11

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  • Preparation and photocatalytic activity of Mo-modified Ti-doped HAp Reviewed

    Noppakhate Jiraborvornpongsa, Toshihiro Isobe, Sachiko Matsushita, Mitsutake Oshikiri, Masato Wakumura, Kotaro Fujii, Masatomo Yashima, Akira Nakajima

    Appl. Catal. B   243   448 - 454   2018.10

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  • Discovery and development of BaNdInO4 —A brief review— Reviewed

    Kotaro Fujii, Masatomo Yashima

    J. Ceram. Soc. Jpn.,   126   852 - 859   2018.10

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  • Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO3-δ as a new bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions Reviewed

    Wenrui Zhang, Masahiro Shiraiwa, Nannan Wang, Tingli Ma, Kotaro Fujii, Eiki Niwa, Masatomo Yashima

    J. Ceram. Soc. Jpn.   126   814 - 819   2018.10

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  • Chemical Pressure-Induced Anion Order–Disorder Transition in LnHO Enabled by Hydride Size Flexibility Reviewed

    Hiroki Yamashita, Thibault Broux, Yoji Kobayashi, Fumitaka Takeiri, Hiroki Ubukata, Tong Zhu, Michael A Hayward, Kotaro Fujii, Masatomo Yashima, Kazuki Shitara, Akihide Kuwabara, Taito Murakami, Hiroshi Kageyama

    J. Am. Chem. Soc.   140 ( 36 )   11170 - 11173   2018.8

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  • Structural Change in SrSiO3 Induced by Introduction of Nitrogen Reviewed

    Makoto Kobayashi, Jihae Kim, Hironori Sato, Takuya Yasunaga, Hideki Kato, Kotaro Fujii, Masahiro Shiraiwa, Masatomo Yashima, Masato Kakihana

    Chem. Lett.   126   1327 - 1329   2018.8

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  • Function of Tetrahedral ZnS3O Building Blocks in the Formation of SrZn2S2O: A Phase Matchable Polar Oxysulfide with a Large Second Harmonic Generation Response Reviewed

    Yoshihiro Tsujimoto, Christian A Juillerat, Weiguo Zhang, Kotaro Fujii, Masatomo Yashima, P Shiv Halasyamani, Hans-Conrad zur Loye

    Chem. Mater.   30   6486 - 6493   2018.8

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  • Undoped Layered Perovskite Oxynitride Li2 LaTa2 O6 N for Photocatalytic CO2 Reduction with Visible Light. Reviewed International journal

    Takayoshi Oshima, Tom Ichibha, Ken Sinkou Qin, Kanemichi Muraoka, Junie Jhon M Vequizo, Keisuke Hibino, Ryo Kuriki, Shunsuke Yamashita, Kenta Hongo, Tomoki Uchiyama, Kotaro Fujii, Daling Lu, Ryo Maezono, Akira Yamakata, Hideki Kato, Koji Kimoto, Masatomo Yashima, Yoshiharu Uchimoto, Masato Kakihana, Osamu Ishitani, Hiroshi Kageyama, Kazuhiko Maeda

    Angewandte Chemie (International ed. in English)   57 ( 27 )   8154 - 8158   2018.7

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    Oxynitrides are promising visible-light-responsive photocatalysts, but their structures are almost confined with three-dimensional (3D) structures such as perovskites. A phase-pure Li2 LaTa2 O6 N with a layered perovskite structure was successfully prepared by thermal ammonolysis of a lithium-rich oxide precursor. Li2 LaTa2 O6 N exhibited high crystallinity and visible-light absorption up to 500 nm. As opposed to well-known 3D oxynitride perovskites, Li2 LaTa2 O6 N supported by a binuclear RuII complex was capable of stably and selectively converting CO2 into formate under visible light (λ>400 nm). Transient absorption spectroscopy indicated that, as compared to 3D oxynitrides, Li2 LaTa2 O6 N possesses a lower density of mid-gap states that work as recombination centers of photogenerated electron/hole pairs, but a higher density of reactive electrons, which is responsible for the higher photocatalytic performance of this layered oxynitride.

    DOI： 10.1002/anie.201803931

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  • Discovery of Oxide-Ion Conductors with a New Crystal Structure, BaSc2-xAxSi3O10-x/2 (A: Mg, Ca) by Screening Sc-Containing Oxides through the Bond-Valence Method and Experiments Reviewed

    Eiki Niwa, Masatomo Yashima

    ACS Appl. Energy Mater.   1   4009 - 4015   2018.7

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  • Single Crystal Growth of Sillen-Aurivillius Perovskite Oxyhalides Bi4NbO8X (X = Cl, Br) Reviewed

    Zhong Chengchao, Kato Daichi, Takeiri Fumitaka, Fujii Kotaro, Yashima Masatomo, Nishiwaki Emily, Fujii Yasuhiro, Koreeda Akitoshi, Tassel Cedric, Abe Ryu, Kageyama Hiroshi

    INORGANICS   6 ( 2 )   41 - 41   2018.6

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    DOI： 10.3390/inorganics6020041

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  • Redshift and thermal quenching of Ce3+ emission in (Gd,Y)3(Al, Si)5(O, N)12 oxynitride garnet phosphors Reviewed

    Kazuki Asami, Jumpei Ueda, Masahiro Shiraiwa, Kotaro Fujii, Masatomo Yashima, Setsuhisa Tanabe

    Opt. Mater.   2018.6

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  • Synthesis, Crystal Structure, and Optical Properties of Layered Perovskite Scandium Oxychlorides: Sr2ScO3Cl, Sr3Sc2O5Cl2, and Ba3Sc2O5Cl2 Reviewed

    Yu Su, Yoshihiro Tsujimoto, Kotaro Fujii, Makoto Tatsuta, Kengo Oka, Masatomo Yashima, Hiraku Ogino, Kazunari Yamaura

    Inorganic Chemistry   57 ( 9 )   5615 - 5623   2018.5

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    DOI： 10.1021/acs.inorgchem.8b00573

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  • Crystal structure and electrical conductivity of BaR2ZnO5 (R = Sm, Gd, Dy, Ho, and Er)®a new structure family of oxide-ion conductors Reviewed

    Keigo Nakamura, Kotaro Fujii, Eiki Niwa, Masatomo Yashima

    Journal of the Ceramic Society of Japan   126 ( 5 )   292 - 299   2018.5

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    DOI： 10.2109/jcersj2.17252

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  • Experimental visualization of oxide-ion diffusion paths in pyrochlore-type Yb2Ti2O7 Reviewed

    Wataru Uno, Kotaro Fujii, Eiki Niwa, Shuki Torii, Ping Miao, Takashi Kamiyama, Masatomo Yashima

    Journal of the Ceramic Society of Japan   126 ( 5 )   341 - 345   2018.5

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    DOI： 10.2109/jcersj2.17253

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  • Selective Hydride Occupation in BaVO3-xHx (0.3 ≤ × ≤ 0.8) with Faceand Corner-Shared Octahedra Reviewed

    Takafumi Yamamoto, Kazuki Shitara, Shunsaku Kitagawa, Akihide Kuwabara, Masahiro Kuroe, Kenji Ishida, Masayuki Ochi, Kazuhiko Kuroki, Kotaro Fujii, Masatomo Yashima, Craig M. Brown, Hiroshi Takatsu, Cedric Tassel, Hiroshi Kageyama

    Chemistry of Materials   30 ( 5 )   1566 - 1574   2018.3

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    DOI： 10.1021/acs.chemmater.7b04571

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  • New Precursor Route Using a Compositionally Flexible Layered Oxide and Nanosheets for Improved Nitrogen Doping and Photocatalytic Activity Reviewed

    Kazuhiko Maeda, Yuki Tokunaga, Keisuke Hibino, Kotaro Fujii, Hiroyuki Nakaki, Tomoki Uchiyama, Miharu Eguchi, Daling Lu, Shintaro Ida, Yoshiharu Uchimoto, Masatomo Yashima

    ACS Appl. Energy Mater.   1 ( 4 )   1734 - 1741   2018.3

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  • High oxide-ion conductivity in Si-deficient La9.565(Si5.826□0.174)O26 apatite without interstitial oxygens due to the overbonded channel oxygens Reviewed

    Kotaro Fujii, Masatomo Yashima, Keisuke Hibino, Masahiro Shiraiwa, Koichiro Fukuda, Susumu Nakayama, Nobuo Ishizawa, Takayasu Hanashima, Takashi Ohhara

    Journal of Materials Chemistry A   6 ( 23 )   10835 - 10846   2018

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry  

    DOI： 10.1039/c8ta02237b

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  • A new structure family of oxide-ion conductors Ca0.8Y2.4Sn0.8O6 discovered by a combined technique of the bond-valence method and experiments Reviewed

    Ryota Inoue, Kotaro Fujii, Masahiro Shiraiwa, Eiki Niwa, Masatomo Yashima

    Dalton Transactions   47 ( 22 )   7515 - 7521   2018

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    DOI： 10.1039/c8dt01024b

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  • Crystal structure of blue-colored ceria during redox reactions in a hydrogen atmosphere Reviewed

    Takeshi Matsukawa, Akinori Hoshikawa, Eiki Niwa, Masatomo Yashima, Toru Ishigaki

    CrystEngComm   20 ( 2 )   155 - 158   2018

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    DOI： 10.1039/c7ce02035j

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  • High pressure synthesis of hydride-fluoride pyrochlore NaCaMg2F7 1 xHx Reviewed

    Kazunari Arai, Yoji Kobayashi, Ya Tang, Yusuke Tsutsui, Daisuke Sakamaki, Takafumi Yamamoto, Kotaro Fujii, Masatomo Yashima, Shu Seki, Hiroshi Kageyama

    Chemistry Letters   47 ( 7 )   829 - 832   2018

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Chemical Society of Japan  

    DOI： 10.1246/cl.180256

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  • A systematic evaluation of the role of lanthanide elements in functional complex oxides; Implications for energy conversion devices Reviewed

    Ji Wu, Kotaro Fujii, Masatomo Yashima, Aleksandar Staykov, Taner Akbay, Tatsumi Ishihara, John A. Kilner

    Journal of Materials Chemistry A   6 ( 25 )   11819 - 11829   2018

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    DOI： 10.1039/c8ta01191e

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  • Crystal Structure and Chemical Bonding of Mixed-Anion Compounds

    Yashima Masatomo

    Ceramics Japan = セラミックス : bulletin of the Ceramic Society of Japan   52 ( 12 )   839 - 843   2017.12

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  • Weak ferromagnetic ordering in brownmillerite Ca2Fe2O5 and its effect on electric field gradients Reviewed

    Isao Kagomiya, Yuki Hirota, Ken-ichi Kakimoto, Kotaro Fujii, Masahiro Shiraiwa, Masatomo Yashima, Akio Fuwa, Shin Nakamura

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   19 ( 46 )   31194 - 31201   2017.12

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    DOI： 10.1039/c7cp04520d

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  • Crystal-structure and electron-density analyses of the perovskitetype oxynitrides BaNbO2N and SrNbO2N through synchrotron X-ray powder diffraction Reviewed

    Kotaro Fujii, Kazuho Shimada, Masatomo Yashima

    Journal of the Ceramic Society of Japan   125 ( 11 )   808 - 810   2017.11

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    DOI： 10.2109/jcersj2.17177

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  • Problems and Solution Proposals of the Description on the Structure and Chemical Bonding in the High School Chemistry and University Textbooks

    Yashima Masatomo

    Ceramics Japan = セラミックス : bulletin of the Ceramic Society of Japan   52 ( 11 )   754 - 758   2017.11

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  • Structures, electron density and characterization of novel photocatalysts, (BaTaO2N)(1-x)(SrWO2N)(x) solid solutions Reviewed

    Keisuke Hibino, Masatomo Yashima, Takayoshi Oshima, Kotaro Fujii, Kazuhiko Maeda

    DALTON TRANSACTIONS   46 ( 43 )   14947 - 14956   2017.11

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    DOI： 10.1039/c7dt02873c

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  • Analysis of chemical reaction between Li4SiO4 and CO2 by thermogravimetry under various CO2 partial pressures-Clarification of CO2 partial pressure and temperature region of CO2 absorption or desorption Reviewed

    Shingo Kaniwa, Masatoshi Yoshino, Eiki Niwa, Masatomo Yashima, Takuya Hashimoto

    MATERIALS RESEARCH BULLETIN   94   134 - 139   2017.10

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    DOI： 10.1016/j.materresbull.2017.05.054

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  • New Oxide-Ion Conductor SrYbInO4 with Partially Cation-Disordered CaFe2O4-Type Structure Reviewed

    Ayaka Fujimoto, Masatomo Yashima, Kotaro Fujii, James R. Hester

    JOURNAL OF PHYSICAL CHEMISTRY C   121 ( 39 )   21272 - 21280   2017.10

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    DOI： 10.1021/acs.jpcc.7b07911

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  • Synthesis, Structure, and Photoluminescence of a Novel Oxynitride BaYSi2O5N Activated by Eu2+ and Ce3+ Reviewed

    Makoto Kobayashi, Takuya Yasunaga, Hironori Sato, Hideki Kato, Kotaro Fujii, Masatomo Yashima, Masato Kakihana

    CHEMISTRY LETTERS   46 ( 6 )   795 - 797   2017.6

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    DOI： 10.1246/cl.170144

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  • Crystal Structure and Oxide-Ion Conductivity of Ba1+xNd1-xInO4-x/2 Reviewed

    Masahiro Shiraiwa, Kotaro Fujii, Yuichi Esaki, Su Jae Kim, Seongsu Lee, Masatomo Yashima

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   164 ( 13 )   F1392 - F1399   2017

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    DOI： 10.1149/2.0411713jes

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  • Precise structure analysis of inorganic materials for clean energy by maximum-entropy method: Neutron and synchrotron X-ray powder diffraction Studies

    Masatomo Yashima

    Structural Characterization Techniques: Advances and Applications in Clean Energy   223 - 244   2016.8

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    DOI： 10.4032/9789814669351

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  • Hydrothermal Synthesis, Crystal Structure, and Superconductivity of a Double-Perovskite Bi Oxide Reviewed

    Mirza H. K. Rubel, Takahiro Takei, Nobuhiro Kumada, M. Mozahar Ali, Akira Miura, Kiyoharu Tadanaga, Kengo Oka, Masaki Azuma, Masatomo Yashima, Kotaro Fujii, Eisuke Magome, Chikako Moriyoshi, Yoshihiro Kuroiwa, James R. Hester, Maxim Aydeev

    CHEMISTRY OF MATERIALS   28 ( 2 )   459 - 465   2016.1

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    DOI： 10.1021/acs.chemmater.5b02386

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  • Precise Structure Analysis of Materials for Energy and Environment, and New Material Exploration

    八島 正知, 藤井 孝太郎

    希土類 = Rare earths   ( 67 )   25 - 44   2015.11

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  • Invited Review: Some recent developments in the atomic-scale characterization of structural and transport properties of ceria-based catalysts and ionic conductors Reviewed

    Masatomo Yashima

    CATALYSIS TODAY   253   3 - 19   2015.9

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  • Crystal structure, structural disorder and oxide-ion diffusional pathway of the fluorite-type oxides and fluorite-related phases

    Masatomo Yashima

    New Research Trends of Fluorite-Based Oxide Materials: From Basic Chemistry and Materials Science to Engineering Applications   59 - 78   2015.4

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  • Structural Origin of the Anisotropic and Isotropic Thermal Expansion of K2NiF4-Type LaSrAlO4 and Sr2TiO4 Reviewed

    Keishi Kawamura, Masatomo Yashima, Kotaro Fujii, Kazuki Omoto, Keisuke Hibino, Shuntaro Yamada, James R. Hester, Maxim Avdeev, Ping Miao, Shuki Torii, Takashi Kamiyama

    INORGANIC CHEMISTRY   54 ( 8 )   3896 - 3904   2015.4

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    DOI： 10.1021/acs.inorgchem.5b00102

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  • Discovery of a Novel Oxide-Ion Conductor with a New Layered Structure

    Yashima Masatomo, Fujii Kotaro

    Parity   30 ( 1 )   19 - 21   2015.1

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  • Improved oxide-ion conductivity of NdBaInO4 by Sr doping Reviewed

    Kotaro Fujii, Masahiro Shiraiwa, Yuichi Esaki, Masatomo Yashima, Su Jae Kim, Seongsu Lee

    JOURNAL OF MATERIALS CHEMISTRY A   3 ( 22 )   11985 - 11990   2015

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    DOI： 10.1039/c5ta01336d

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  • Crystal Structure, Electron-Density Distribution and Ion-Diffusion Pathway of Ceramic Materials Investigated by Multiple Approaches Including Neutron and X-ray Diffraction Methods

    YASHIMA Masatomo

    Nihon Kessho Gakkaishi   57 ( 1 )   13 - 19   2015

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    Crystal structure is the fundamental information in the materials science, chemistry, physics and geoscience. Electron-density distribution of ceramic materials is important, because most of material properties are governed by the electronic states. Ion-diffusion pathway is useful to understand the ion conduction mechanism. In the present paper the author briefly reviews his group&#039;s recent research works on the crystal structure, thermal expansion, electron-density distribution and ion-diffusion pathway of some ceramic materials investigated by multiple approaches such as synchrotron X-ray powder diffraction, neutron powder diffraction, electron diffraction, first-principles electronic calculations, maximum-entropy method (MEM) and bond valence method. The crystal structure should be examined by multiple methods, because invalid structure sometimes gives good Rietveld fit.

    DOI： 10.5940/jcrsj.57.13

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  • Crystal structure analysis and design of ceramic materials for clean energy

    M. Yashima, K. Fujii

    Fine ceramics report   33 ( 3 )   88 - 93   2015

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  • Structural Origin of the Anisotropic Thermal Expansion of K2NiF4-Type Oxides

    M. Yashima, K. Kawamura, K. Omoto, K. Fujii, K. Hibino

    The Journal of Fuel Cell Technology   15 ( 1 )   21 - 27   2015

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  • Novel Photocatalysts Designed on the Basis of the Crystal Structures, To a Recyclable Energy Source

    Yashima Masatomo

    旭硝子財団助成研究成果報告 Reports of research assisted by the Asahi Glass Foundation   1 - 7   2015

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  • 酸化物イオン伝導体の新構造ファミリーNdBaInO₄を発見

    藤井 孝太郎, 八島 正知

    パリティ   29 ( 9 )   35 - 37   2014.9

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  • Structural Origin of the Anisotropic Thermal Expansion of a K2NiF4-type Oxide CaErAlO4 through Interatomic Distances Reviewed

    Kazuki Omoto, Masatomo Yashima, James R. Hester

    CHEMISTRY LETTERS   43 ( 4 )   515 - 517   2014.4

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    DOI： 10.1246/cl.131164

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  • New Perovskite-Related Structure Family of Oxide-Ion Conducting Materials NdBalnO(4) Reviewed

    Kotaro Fujii, Yuichi Esaki, Kazuki Omoto, Masatomo Yashima, Akinori Hoshikawa, Toru Ishigaki, James R. Hester

    CHEMISTRY OF MATERIALS   26 ( 8 )   2488 - 2491   2014.4

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    DOI： 10.1021/cm500776x

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  • Diffusion Path and Conduction Mechanism of Protons in Hydroxyapatite Reviewed

    Masatomo Yashima, Naoyuki Kubo, Kazuki Omoto, Hirotaka Fujimori, Kotaro Fujii, Kenji Ohoyama

    JOURNAL OF PHYSICAL CHEMISTRY C   118 ( 10 )   5180 - 5187   2014.3

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    DOI： 10.1021/jp412771f

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  • Origin of anisotropic thermal expansion in CaYAIO(4) Reviewed

    Kazuki Omoto, Masatomo Yashima

    APPLIED PHYSICS EXPRESS   7 ( 3 )   2014.3

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    DOI： 10.7567/APEX.7.037301

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  • Crystal structures of a pentavalent bismuthate, SrBi2O6 and a lead bismuth oxide (Pb1/3Bi2/3)O1.4

    Nobuhiro Kumada, Akira Miura, Takahiro Takei, Masatomo Yashima

    Journal of Asian Ceramic Societies   2 ( 2 )   150 - 153   2014

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    DOI： 10.1016/j.jascer.2014.02.002

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  • Diffusional Pathway and Conduction Mechanism of Oxide Ions of Ceramics, - Investigation of the Structural Origin of High Ion Conductivity

    Yashima Masatomo

    Fine ceramics report   32 ( 1 )   22 - 27   2014

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  • Erratum: Origin of anisotropic thermal expansion in CaYAlO4 (Applied Physics Express (2014) 7(037301)) Reviewed

    Kazuki Omoto, Masatomo Yashima

    Applied Physics Express   7 ( 3 )   2014

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    DOI： 10.7567/APEX.7.039201

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  • Defect induced sodium disorder and ionic conduction mechanism in Na1.82Mg1.09P2O7 Reviewed

    Guandong Liu, Shin-ichi Nishimura, Sai Cheong Chung, Kotaro Fujii, Masatomo Yashima, Atsuo Yamada

    JOURNAL OF MATERIALS CHEMISTRY A   2 ( 43 )   18353 - 18359   2014

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    DOI： 10.1039/c4ta03356f

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  • Crystal Structure, Optical Properties, and Electronic Structure of Calcium Strontium Tungsten Oxynitrides CaxSr1-xWO2N Reviewed

    Masatomo Yashima, Uhi Fumi, Hiromi Nakano, Kazuki Omoto, James R. Hester

    JOURNAL OF PHYSICAL CHEMISTRY C   117 ( 36 )   18529 - 18539   2013.9

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    DOI： 10.1021/jp405597x

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  • Experimental Visualization of the Diffusional Pathway of Oxide Ions in a Layered Perovskite-type Cobaltite PrBaCo2O5+delta Reviewed

    Yi-Ching Chen, Masatomo Yashima, Juan Pena-Martinez, John A. Kilner

    CHEMISTRY OF MATERIALS   25 ( 13 )   2638 - 2641   2013.7

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    DOI： 10.1021/cm4010618

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  • Experimental visualization of the Bi-O covalency in ferroelectric bismuth ferrite (BiFeO3) by synchrotron X-ray powder diffraction analysis Reviewed

    Kotaro Fujii, Hiroki Kato, Kazuki Omoto, Masatomo Yashima, Jun Chen, Xianran Xing

    Physical Chemistry Chemical Physics   15 ( 18 )   6779 - 6782   2013.5

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    DOI： 10.1039/c3cp50236h

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  • Crystal structure and oxide-ion diffusion of nanocrystalline, compositionally homogeneous ceria-zirconia Ce0.5Zr 0.5O2 up to 1176 K Reviewed

    Masatomo Yashima, Tomohiro Sekikawa, Daisuke Sato, Hiromi Nakano, Kazuki Omoto

    Crystal Growth and Design   13 ( 2 )   829 - 837   2013.2

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    DOI： 10.1021/cg301530t

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  • Crystal Structure and Catalytic Activity of Ceria-Zirconia Solid Solutions

    Yashima Masatomo

    Material Integration   26 ( 1 )   7 - 11   2013.1

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  • Crystal Structure Analysis and Ion-Conduction Mechanism of Materials for SOFCs

    Yashima Masatomo

    The Journal of Fuel Cell Technology   13 ( 2 )   58 - 64,図巻頭1p   2013

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  • Role of Ga3+ and Cu2+ in the High Interstitial Oxide-Ion Diffusivity of Pr2NiO4-Based Oxides: Design Concept of Interstitial Ion Conductors through the Higher-Valence d(10) Dopant and Jahn-Teller Effect Reviewed

    Masatomo Yashima, Hiroki Yamada, Sirikanda Nuansaeng, Tatsumi Ishihara

    CHEMISTRY OF MATERIALS   24 ( 21 )   4100 - 4113   2012.11

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    DOI： 10.1021/cm3021287

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  • Origin of the Ferrielectricty and Visible-Light Photocatalytic Activity of Silver Niobate AgNbO3 Reviewed

    Masatomo Yashima, Shota Matsuyama

    JOURNAL OF PHYSICAL CHEMISTRY C   116 ( 47 )   24902 - 24906   2012.11

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    DOI： 10.1021/jp310589e

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  • Crystal Structure Analysis of Ferroelectric Ceramics

    Yashima Masatomo

    熱測定   39 ( 3 )   112 - 115   2012.7

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  • Crystal Structure and Ion-Diffusion Pathway of Inorganic Materials through Neutron Diffraction

    YASHIMA Masatomo

    J. Surf. Sci. Soc. Jpn.   33 ( 5 )   284 - 289   2012.5

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    The present brief review describes the application of neutron powder diffractometry and maximum-entropy method to the studies of crystal structure and diffusional pathways of mobile ions in ionic conducting ceramic materials. La&lt;Sub&gt;0.62&lt;/Sub&gt;Li&lt;Sub&gt;0.16&lt;/Sub&gt;TiO&lt;Sub&gt;3&lt;/Sub&gt; and Li&lt;Sub&gt;0.6&lt;/Sub&gt;FePO&lt;Sub&gt;4&lt;/Sub&gt; exhibit two- and one-dimensional networks of Li cation diffusional pathways, respectively. In the fluorite-structured ionic conductors such as ceria solid solution Ce&lt;Sub&gt;0.93&lt;/Sub&gt;Y&lt;Sub&gt;0.07&lt;/Sub&gt;O&lt;Sub&gt;1.96&lt;/Sub&gt;, bismuth oxide solid solution &amp;delta;-Bi&lt;Sub&gt;1.4&lt;/Sub&gt;Yb&lt;Sub&gt;0.6&lt;/Sub&gt;O&lt;Sub&gt;3&lt;/Sub&gt; and copper iodide CuI, a similar curved diffusion pathway along the &amp;lsaquo;100&amp;rsaquo; directions is observed. In the cubic &lt;I&gt;AB&lt;/I&gt;O&lt;Sub&gt;3&lt;/Sub&gt; perovskite-type ionic conductor, lanthanum gallate solid solution, the mobile ions diffuse along a curved line keeping the interatomic distance between the &lt;I&gt;B&lt;/I&gt; cation and O&lt;Sup&gt;2-&lt;/Sup&gt; anion. We have experimentally confirmed that the anisotropic thermal motions of the apex O2 atom and the interstitial O3 atoms are essential for the high oxygen permeability of the K&lt;Sub&gt;2&lt;/Sub&gt;NiF&lt;Sub&gt;4&lt;/Sub&gt;-type mixed conductor. Diffusion paths of proton are visualized along &lt;I&gt;c&lt;/I&gt; axis in hexagonal hydroxyapatite.

    DOI： 10.1380/jsssj.33.284

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  • Crystal Structure, Oxygen Deficiency, and Oxygen Diffusion Path of Perovskite-Type Lanthanum Cobaltites La0.4Ba0.6CoO3-delta and La0.6Sr0.4CoO3-delta Reviewed

    Yi-Ching Chen, Masatomo Yashima, Takashi Ohta, Kenji Ohoyama, Shinji Yamamoto

    JOURNAL OF PHYSICAL CHEMISTRY C   116 ( 8 )   5247 - 5255   2012.3

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    DOI： 10.1021/jp210271n

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  • Experimental Visualization of Chemical Bonding and Structural Disorder in Hydroxyapatite through Charge and Nuclear-Density Analysis Reviewed

    Masatomo Yashima, Yukihiko Yonehara, Hirotaka Fujimori

    JOURNAL OF PHYSICAL CHEMISTRY C   115 ( 50 )   25077 - 25087   2011.12

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    DOI： 10.1021/jp208746y

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  • Structural analysis of Li2TiO3 by synchrotron X-ray diffraction at high temperature Reviewed

    Kazuki Omoto, Takuya Hashimoto, Kazuya Sasaki, Takayuki Terai, Tsuyoshi Hoshino, Masatomo Yashima

    JOURNAL OF NUCLEAR MATERIALS   417 ( 1-3 )   692 - 695   2011.10

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    DOI： 10.1016/j.jnucmat.2010.12.257

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  • Mixed Conductivity, Nonstoichiometric Oxygen, and Oxygen Permeation Properties in Co-Doped Sr3Ti2O7-delta Reviewed

    Sirikanda Nuansaeng, Masatomo Yashima, Maki Matsuka, Tatsumi Ishihara

    CHEMISTRY-A EUROPEAN JOURNAL   17 ( 40 )   11324 - 11331   2011.9

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    DOI： 10.1002/chem.201003644

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  • Structure of photocatalysts which yield hydrogen from water

    Yashima Masatomo

    Material stage   11 ( 5 )   15 - 17   2011.8

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  • Evidence for (Bi,Pb)-O Covalency in the High T-C Ferroelectric PbTiO3-BiFeO3 with Large Tetragonality Reviewed

    Masatomo Yashima, Kazuki Omoto, Jun Chen, Hiroki Kato, Xianran Xing

    CHEMISTRY OF MATERIALS   23 ( 13 )   3135 - 3137   2011.7

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    DOI： 10.1021/cm2001184y

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  • Ion diffusion mechanism in ion-conducting materials through neutron diffractometry

    Yashima Masatomo

    Hamon   21 ( 2 )   96 - 99   2011.5

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  • Crystal Structure and Electron Density of Imma Perovskite-Type Oxynitride LaTiO_2N : Structural Origin of Visible-light Response

    YASHIMA Masatomo, SAITO Mio

    Nihon Kessho Gakkaishi   53 ( 2 )   107 - 112   2011.4

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    Highly crystalline lanthanum titanium oxynitride LaTiO&lt;sub&gt;2&lt;/sub&gt;N has been determined to have an &lt;i&gt;Imma&lt;/i&gt; perovskite-type structure with &lt;i&gt;a&lt;/i&gt;&lt;sup&gt;0&lt;/sup&gt;&lt;i&gt;b&lt;/i&gt;&lt;sup&gt;&amp;mdash;&lt;/sup&gt;&lt;i&gt;b&lt;/i&gt;&lt;sup&gt;&amp;mdash;&lt;/sup&gt; tilt system by the electron, neutron and synchrotron diffraction experiments (Yashima &lt;i&gt;et al&lt;/i&gt;., &lt;i&gt;Chem. Comm&lt;/i&gt;., &lt;b&gt;46&lt;/b&gt;, 4704-4706 (2010)). The refined crystallographic parameters agree well with those of the optimized structure obtained by density functional theory-based calculations. Experimental and theoretical electron densities indicate the covalent bonding between Ti cation and N,O anions. The covalent bonding and existence of N atoms are responsible for the reduced band gap, which leads to the visible-light response of LaTiO&lt;sub&gt;2&lt;/sub&gt;N photocatalyst.

    DOI： 10.5940/jcrsj.53.107

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  • Crystal structure and electron-density distribution of visible-light responsive photocatalysts for water decomposition

    Yashima Masatomo

    The Journal of fuel cell technology   10 ( 4 )   111 - 117,図巻頭1p   2011

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  • Structure and electrical properties of the new pyrochlore-type protonic solid electrolyte K0.88Nb2O7.58H4.28

    O. Smirnova, N. Kumada, T. Takei, Y. Yonesaki, M. Yashima, N. Kinomura

    ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE   66   594 - 602   2010.12

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    DOI： 10.1107/S0108768110038620

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  • Stability field of the high-temperature orthorhombic phase in the enstatite-diopside system Reviewed

    Shugo Ohi, Akira Miyake, Masatomo Yashima

    AMERICAN MINERALOGIST   95 ( 8-9 )   1267 - 1275   2010.8

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    DOI： 10.2138/am.2010.3450

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  • 無機・金属 ニッケル酸プラセオジム系混合伝導体における酸素透過メカニズム

    八島 正知

    未来材料   10 ( 8 )   35 - 40   2010.8

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  • Atomic Displacement Parameters of Ceria Doped with Rare-Earth Oxide Ce0.8R0.2O19 (R = La, Nd, Sm, Gd, Y, and Yb) and Correlation with Oxide-Ion Conductivity (vol 114, pg 2385, 2010)

    M. Yashima, T. Takizawa

    JOURNAL OF PHYSICAL CHEMISTRY C   114 ( 23 )   10670 - 10670   2010.6

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  • Crystal Structure Analysis of Catalysts by Neutron Powder Diffractometry

    YASHIMA Masatomo

    Radioisotopes   59 ( 3 )   221 - 229   2010.3

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    DOI： 10.3769/radioisotopes.59.221

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  • Crystal Structure Analysis of Ionic Conducting Ceramic Materials by Means of Neutron Diffractometry

    YASHIMA Masatomo

    Radioisotopes   59 ( 3 )   201 - 210   2010.3

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    DOI： 10.3769/radioisotopes.59.201

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  • Atomic Displacement Parameters of Ceria Doped with Rare-Earth Oxide Ce0.8R0.2O1.9 (R = La, Nd, Sm, Gd, Y, and Yb) and Correlation with Oxide-Ion Conductivity Reviewed

    Masatomo Yashima, Tomoya Takizawa

    JOURNAL OF PHYSICAL CHEMISTRY C   114 ( 5 )   2385 - 2392   2010.2

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    DOI： 10.1021/jp910925t

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  • (Applications 4)Crystal Structure Analysis of Ionic Conducting Ceramic Materials by Means of Neutron Diffractometry

    YASHIMA Masatomo

    RADIOISOTOPES   59 ( 3 )   201 - 210   2010

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    The crystal structure and ionic diffusion path of ionic and mixed ionic-electronic conductors, which are important in a variety of applications such as fuel cells, gas sensors, catalyst and batteries, are reviewed. &amp;alpha;-AgI has many occupational sites of mobile Ag ions. &amp;beta;-alumina exhibits two-dimensional Na ionic diffusion. In the fluorite-structured superionic conductors such as ceria solid solution Ce&lt;SUB&gt;0.93&lt;/SUB&gt;Y&lt;SUB&gt;0.07&lt;/SUB&gt;O&lt;SUB&gt;1.96&lt;/SUB&gt;, bismuth oxide solid solution &amp;delta;-Bi&lt;SUB&gt;1.4&lt;/SUB&gt;Yb&lt;SUB&gt;0.6&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt; and copper iodide CuI, a similar curved diffusion pathway along the &lt;100&gt; directions is observed. In the ionic conductors with the cubic ABO&lt;SUB&gt;3&lt;/SUB&gt; perovskite-type structure such as lanthanum gallate and lanthanum cobaltite solid solutions, the mobile ions diffuses along a curved line keeping the interatomic distance between the B cation and O&lt;SUP&gt;2&amp;minus;&lt;/SUP&gt; anion to some degree. The structure and diffusion path of double-perovskite-type La&lt;SUB&gt;0.64&lt;/SUB&gt;Ti&lt;SUB&gt;0.92&lt;/SUB&gt;Nb&lt;SUB&gt;0.08&lt;/SUB&gt;O&lt;SUB&gt;2.99&lt;/SUB&gt;, K&lt;SUB&gt;2&lt;/SUB&gt;NiF&lt;SUB&gt;4&lt;/SUB&gt;-type(Pr&lt;SUB&gt;0.9&lt;/SUB&gt;La&lt;SUB&gt;0.1&lt;/SUB&gt;)&lt;SUB&gt;2&lt;/SUB&gt;(Ni&lt;SUB&gt;0.74&lt;/SUB&gt;Cu&lt;SUB&gt;0.21&lt;/SUB&gt;Ga&lt;SUB&gt;0.05&lt;/SUB&gt;)O&lt;SUB&gt;4+&amp;delta;&lt;/SUB&gt;, and apatite-type La&lt;SUB&gt;9.69&lt;/SUB&gt;(Si&lt;SUB&gt;5.70&lt;/SUB&gt;Mg&lt;SUB&gt;0.30&lt;/SUB&gt;)O&lt;SUB&gt;26.24&lt;/SUB&gt; are described. The structure and diffusion path of lithium-ion conductors La&lt;SUB&gt;0.62&lt;/SUB&gt;Li&lt;SUB&gt;0.16&lt;/SUB&gt;TiO&lt;SUB&gt;3&lt;/SUB&gt; and Li&lt;SUB&gt;0.6&lt;/SUB&gt;FePO&lt;SUB&gt;4&lt;/SUB&gt; are also discussed. The diffusion paths of La&lt;SUB&gt;0.62&lt;/SUB&gt;Li&lt;SUB&gt;0.16&lt;/SUB&gt;TiO&lt;SUB&gt;3&lt;/SUB&gt; and Li&lt;SUB&gt;0.6&lt;/SUB&gt;FePO&lt;SUB&gt;4&lt;/SUB&gt; are two-and one-dimensional, respectively.

    DOI： 10.3769/radioisotopes.59.201

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  • Imma perovskite-type oxynitride LaTiO2N: structure and electron density Reviewed

    Masatomo Yashima, Mio Saito, Hiromi Nakano, Tsuyoshi Takata, Kiyonori Ogisu, Kazunari Domen

    CHEMICAL COMMUNICATIONS   46 ( 26 )   4704 - 4706   2010

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    DOI： 10.1039/c0cc00573h

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  • Experimental visualization of covalent bonds and structural disorder in a gallium zinc oxynitride photocatalyst (Ga1-xZnx)(N1-xOx): origin of visible light absorption Reviewed

    Masatomo Yashima, Hiroki Yamada, Kazuhiko Maeda, Kazunari Domen

    CHEMICAL COMMUNICATIONS   46 ( 14 )   2379 - 2381   2010

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    DOI： 10.1039/b922008a

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  • (Applications 6)Crystal Structure Analysis of Catalysts by Neutron Powder Diffractometry

    YASHIMA Masatomo

    RADIOISOTOPES   59 ( 3 )   221 - 229   2010

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    A brief review of neutron powder diffractometry, which is applied to the studies of the crystal structure and nuclear-density distribution, and to the study of the existing phases and phase transition of inorganic catalysts is presented. Occupancy of oxygen atom at nitrogen atomic site can be refined by the Rietveld analysis of neutron diffraction data of oxynitride photocatalysts. Crystal structure, phase transition and nuclear-density distribution of ceria-zirconia automobile exhaust gas catalysts have been investigated by the neutron diffractometry. Atomic displacement parameters and nuclear density enable to discuss the oxygen-ion diffusivity and catalytic activity. Neutron diffractometry has been utilized to study the crystal structure and diffusion pathway of oxygen ions in perovskite-type and related oxides.

    DOI： 10.3769/radioisotopes.59.221

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  • Visualization of ion-diffusion path in ionic conducting ceramic materials

    Yashima Masatomo

    The Journal of fuel cell technology   9 ( 4 )   83 - 89,図巻頭1p   2010

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  • Crystal structure and electron density in the apatite-type ionic conductor La-9.71(Si5.81Mg0.18)O-26.37 Reviewed

    Roushown Ali, Masatomo Yashima, Yoshitaka Matsushita, Hideki Yoshioka, Fujio Izumi

    JOURNAL OF SOLID STATE CHEMISTRY   182 ( 10 )   2846 - 2851   2009.10

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    DOI： 10.1016/j.jssc.2009.07.053

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  • Diffusion pathway of mobile ions and crystal structure of ionic and mixed conductors - A brief review Reviewed

    Masatomo Yashima

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   117 ( 1370 )   1055 - 1059   2009.10

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    DOI： 10.2109/jcersj2.117.1055

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  • Crystal Structures of the Tetragonal Ceria-Zirconia Solid Solutions CexZr1-xO2 through First Principles Calculations (0 &lt;= x &lt;= 1) Reviewed

    Masatomo Yashima

    JOURNAL OF PHYSICAL CHEMISTRY C   113 ( 29 )   12658 - 12662   2009.7

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    DOI： 10.1021/jp9024156

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  • 酸化物の結晶構造解析により可視化した酸素イオンの拡散経路

    八島 正知

    ペトロテック = Petrotech   32 ( 5 )   335 - 340   2009.5

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  • Experimental Visualization of Lithium Diffusion in Li_xFePO_4

    YAMADA Atsuo, YASHIMA Masatomo

    Nihon Kessho Gakkaishi   51 ( 2 )   175 - 181   2009.4

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    The lithium ion battery is the most advanced energy storage system, but the application has been limited to portable electronics devices due to cost and safety issues. State-of-the-art LiFePO&lt;sub&gt;4&lt;/sub&gt; technology has now opened the door for lithium ion batteries to get into the large scale application as plug-in hybrid vehicles. Geometric information on the lithium diffusion is essential to understand the facile electrode reaction of Li&lt;sub&gt;x&lt;/sub&gt;FePO&lt;sub&gt;4&lt;/sub&gt;(0 &lt; x &lt; 1), but the previous approach has been limited to the computational prediction. Here, combining high-temperature powder neutron diffraction and the maximum entropy method, lithium distribution along [010] direction was clearly visualized.

    DOI： 10.5940/jcrsj.51.175

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  • Atomic displacement parameters and structural disorder of oxygen ions in the CexZr1-xO2 solid solutions (0.12 &lt;= x &lt;= 1.0): Possible factors of high catalytic activity of ceria-zirconia catalysts Reviewed

    Masatomo Yashima, Takahiro Wakita

    APPLIED PHYSICS LETTERS   94 ( 17 )   2009.4

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    DOI： 10.1063/1.3124244

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  • Diffusion Paths of Mobile Ions Studied by Precise Structure Analysis of Powder Diffraction Data Measured in situ at High Temperatures

    YASHIMA Masatomo

    Nihon Kessho Gakkaishi   51 ( 2 )   153 - 161   2009.4

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    The present paper is a brief review of our recent works on the crystal structures, structural disorders and ion-diffusion paths of various ionic and mixed conductors. Diffusion paths along the &lt;100&gt; directions are observed in the fluorite-type ionic conductors such as &amp;delta;-Bi&lt;sub&gt;1.4&lt;/sub&gt;Yb&lt;sub&gt;0.6&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;, Ce&lt;sub&gt;0.93&lt;/sub&gt;Y&lt;sub&gt;0.07&lt;/sub&gt;O&lt;sub&gt;1.96&lt;/sub&gt;, Y&lt;sub&gt;0.785&lt;/sub&gt;Ta&lt;sub&gt;0.215&lt;/sub&gt;O&lt;sub&gt;1.715&lt;/sub&gt; and &amp;alpha;-CuI. In the prerovskite-type and double-prerovskite-type conductors, the mobile oxide ions move along the &lt;100&gt; directions near the stable positions and along &lt;110&gt; around the midway of diffusion pathway. The cubic prerovskite-type and double-prerovskite-type conductors exhibit three- and two-dimensional networks of diffusion pathways, respectively. K&lt;sub&gt;2&lt;/sub&gt;NiF&lt;sub&gt;4&lt;/sub&gt;-type conductor has a two-dimensional network of diffusion pathway through interstitial oxide ions. The oxide ions in apatite-type conductors diffuse along the hexagonal &lt;i&gt;c&lt;/i&gt;-axis. The diffusion paths of two lithium-ion conductors are also presented.

    DOI： 10.5940/jcrsj.51.153

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  • Electronic structure and magnetic properties of monoclinic beta-Cu2V2O7: A GGA+U study Reviewed

    Masatomo Yashima, Ryosuke O. Suzuki

    PHYSICAL REVIEW B   79 ( 12 )   2009.3

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    DOI： 10.1103/PhysRevB.79.125201

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  • Structural phase transition and octahedral tilting in the calcium titanate perovskite CaTiO3 Reviewed

    Masatomo Yashima, Roushown Ali

    SOLID STATE IONICS   180 ( 2-3 )   120 - 126   2009.3

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  • Isolation of Solid Solution Phases in Size-Controlled LixFePO4 at Room Temperature Reviewed

    Genki Kobayashi, Shn-ichi Nishimura, Min-Sik Park, Ryoji Kanno, Masatomo Yashima, Takashi Ida, Atsuo Yamada

    ADVANCED FUNCTIONAL MATERIALS   19 ( 3 )   395 - 403   2009.2

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  • "Emerging Materials for Advanced Ceramics - New Materials, Structural Analysis and Characterization" Preface Reviewed

    Shinichi Kikkawa, Hisanori Yamane, Nobuhiro Kumada, Masatomo Yashima, Akira Yoshiasa

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   117 ( 1361 )   2009.1

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  • Hydrothermal Synthesis of a New Double Perovskite-Type Bismuthate, (Ba0.75K0.14H0.11)BiO3 center dot nH(2)O

    Hong Jiang, Nobuhiro Kumada, Yoshinori Yonesaki, Takahiro Takei, Nobukazu Kinomura, Masatorno Yashima, Masaki Azuma, Kengo Oka, Yuichi Shimakawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   48 ( 1 )   2009.1

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    DOI： 10.1143/JJAP.48.010216

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  • Analysis of crystal structure and phase relationship of Ba2-xLaxIn2O5+delta by high temperature synchrotron X-ray diffraction and thermal analyses - Control of electrical conductivity and crystal structure by concentration of oxide ion vacancy Reviewed

    Takuya Hashimoto, Takayuki Sugimoto, Kazuki Omoto, Masashi Yoshinaga, Masahiko Tanaka, Masatomo Yashima

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   117 ( 1361 )   60 - 65   2009.1

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    DOI： 10.2109/jcersj2.117.60

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  • Structural analysis of oxide ion conductor, Ba2-xSrxIn2O5 and Ba2In2-xGaxO5 - Significance of synchrotron X-ray diffraction at high temperatures Reviewed

    Takuya Hashimoto, Masashi Yoshinaga, Koutatsu Nakano, Kazuki Omoto, Takayuki Sugimoto, Masahiko Tanaka, Masatomo Yashima

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   117 ( 1361 )   56 - 59   2009.1

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  • Order-disorder and displacive components in the ferroelectric-paraelectric phase transition of potassium titanyl phosphate KTiOPO4 Reviewed

    Masatomo Yashima, Takafumi Komatsu

    CHEMICAL COMMUNICATIONS   ( 9 )   1070 - 1072   2009

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    DOI： 10.1039/b817280c

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  • Report of research & development: Phase transition and structural disorder of ceria-zirconia catalysts

    Wakita Takahiro, Yashima Masatomo

    Fine chemicals   37 ( 12 )   23 - 32   2008.12

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  • Crystal Structure-Property Correlation in Ionic and Mixed Conductors and Photocatalyst, Visualization of Diffusion Path of Mobile Ions in Perovskite-Type and Perovskite-Related Oxides and of Chemical Bonding in Sm_2Ti_2S_2O_<4.9>

    YASHIMA Masatomo

    Ceramics Japan   43 ( 11 )   922 - 928   2008.11

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  • An isosymmetric phase transition of orthopyroxene found by high-temperature X-ray diffraction Reviewed

    Shugo Ohi, Akira Miyake, Norimasa Shimobayashi, Masatomo Yashima, Masao Kitamura

    AMERICAN MINERALOGIST   93 ( 10 )   1682 - 1685   2008.10

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  • Structure of Li2FeSiO4 Reviewed

    Shin-ichi Nishimura, Shogo Hayase, Ryoji Kanno, Masatomo Yashima, Noriaki Nakayama, Atsuo Yamada

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   130 ( 40 )   13212 - 13213   2008.10

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    DOI： 10.1021/ja805543p

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  • Crystal structures, structural disorders and diffusion paths of ionic conductors from diffraction experiments Reviewed

    Masatomo Yashima

    SOLID STATE IONICS   179 ( 21-26 )   797 - 803   2008.9

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    DOI： 10.1016/j.ssi.2007.12.099

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  • Diffusion Path of Oxide Ions in an Apatite-Type Ionic Conductor La-9.69(Si5.70Mg0.30)O-26.24 Reviewed

    Roushown Ali, Masatomo Yashima, Yoshitaka Matsushita, Hideki Yoshioka, Kenji Ohoyama, Fujio Izumi

    CHEMISTRY OF MATERIALS   20 ( 16 )   5203 - 5208   2008.8

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    DOI： 10.1021/cm7035234

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  • Structure and electron density of oxysulfide Sm2Ti2S2O4.9, a visible-light-responsive photocatalyst Reviewed

    Masatomo Yashima, Kiyonori Ogisu, Kazunari Domen

    ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE   64   291 - 298   2008.6

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    DOI： 10.1107/S0108768108007532

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  • Structural disorder in the cubic Ce0.5Zr0.5O2 catalyst: A possible factor of the high catalytic activity Reviewed

    Takahiro Wakita, Masatomo Yashima

    APPLIED PHYSICS LETTERS   92 ( 10 )   2008.3

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    DOI： 10.1063/1.2890718

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  • Neutron diffraction study of the perovskite-type lanthanum cobaltite La0.6Sr0.4Co0.8Fe0.2O3-delta at 1260 degrees C and 394 degrees C Reviewed

    Masatomo Yashima, Taisuke Kamioka

    SOLID STATE IONICS   178 ( 39-40 )   1939 - 1943   2008.3

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    DOI： 10.1016/j.ssi.2008.01.032

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  • Crystal structure of NaCl-type transition metal monocarbides MC (M = V, Ti, Nb, Ta, Hf, Zr), a neutron powder diffraction study Reviewed

    Kazumasa Nakamura, Masatomo Yashima

    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS   148 ( 1-3 )   69 - 72   2008.2

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    DOI： 10.1016/j.mseb.2007.09.040

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  • Electronic and crystal structures of nanolaminate yttrium aluminum carbide YAl3C3 Reviewed

    Masatomo Yashima, Koichiro Fukuda, Yasunori Tabira, Miyuki Hisamura

    CHEMICAL PHYSICS LETTERS   451 ( 1-3 )   48 - 52   2008.1

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    DOI： 10.1016/j.cplett.2007.11.089

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  • Crystal structure and phase diagram of Y or Sc-containing oxide materials

    Yashima Masatomo

    Materials integration   21 ( 1 )   3 - 7   2008.1

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  • An isosymmetric phase transition of orthopyroxene found by high-temperature experiment

    Ohi Shugo, Miyake Akira, Shimobayashi Norimasa, Yashima Masatomo, Kitamura Masao

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2008   126 - 126   2008

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    High-temperature synchrotron X-ray powder diffraction experiments for the composition of (Ca0.06Mg1.94)Si2O6 have been carried out in the present study to clarify whether orthopyroxene has a transition between low- and high-temperature phases. Our results show that discontinuous changes of unit-cell dimensions and volume occur at 1170°C during both heating and cooling processes and that the space group of Pbca does not change during this reversible phase transition. These facts indicate a first-order and isosymmetric phase transition. This high-temperature phase is thermodynamically distinct from the low-temperature phase, i.e., orthoenstatite in the Mg-rich portion of Mg2Si2O6-CaMgSi2O6 phase diagram, although they have the same space group.

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  • Crystal Structure and Electron Density of Inorganic Materials Studied by High-resolution Synchrotron Powder Diffractometry

    YASHIMA Masatomo

    Nihon Kessho Gakkaishi   49 ( 6 )   354 - 358   2007.12

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    High angular resolution of a powder diffractometer enables the precise structural analysis of crystalline materials. Here we review the results of precise analyses of crystal structure and electron density in some inorganic materials such as barium-doped &amp;alpha;-tricalcium phosphate (Ba-&amp;alpha;-TCP), &amp;alpha;-silicon nitride, tantalum oxynitride TaON photocatalyst and zirconium oxide nano-particles. These studies were carried out with a multi-detector system at the beam line 4B&lt;SUB&gt;2&lt;/SUB&gt; of Photon Factory, KEK. In Ba-&amp;alpha;-TCP, Ba atoms are located at three crystallographic Ca sites among eighteen Ca sites. Covalent bonding is visualized in TaON, &amp;alpha;-silicon nitride and zirconium oxide. A new furnace to measure the diffraction profile up to 1800 K is available at the 4B&lt;SUB&gt;2&lt;/SUB&gt; beam line.

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  • Structural investigation of the cubic perovskite-type doped lanthanum cobaltite La0.6Sr0.4CoO3-delta at 1531 K: possible diffusion path of oxygen ions in an electrode material Reviewed

    Masatomo Yashima, Takayuki Tsuji

    JOURNAL OF APPLIED CRYSTALLOGRAPHY   40   1166 - 1168   2007.12

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  • Crystal Structural Changes and Phase Diagrams of Ceria-based Materials

    YASHIMA Masatomo

    Ceramics Japan   42 ( 11 )   832 - 835   2007.11

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  • Crystal structure and site preference of Ba-doped alpha-tricalcium phosphate (Ca1-xBax)(3)(PO4)(2) through high-resolution synchrotron powder diffraction (x=0.05 to 0.15) Reviewed

    Masatomo Yashima, Yoichi Kawaike

    CHEMISTRY OF MATERIALS   19 ( 16 )   3973 - 3979   2007.8

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    DOI： 10.1021/cm070963y

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  • Crystal structure, disorder, and diffusion path of oxygen ion conductors Y1-xTaxO1.5+x (x=0.215 and 0.30) Reviewed

    Masatomo Yashima, Takayuki Tsuji

    CHEMISTRY OF MATERIALS   19 ( 14 )   3539 - 3544   2007.7

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    DOI： 10.1021/cm070910g

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  • In situ observation of the tetragonal-cubic phase transition in the CeZrO4 solid solution - a high temperature neutron diffraction study Reviewed

    Takahiro Wakita, Masatomo Yashima

    ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS   63   384 - 389   2007.6

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  • Diffusion path of oxide ions in an oxide ion conductor La-0.64(Ti0.92Nb0.08)O-2.99 with a double perovskite-type structure Reviewed

    Roushown Ali, Masatomo Yashima, Fujio Izumi

    CHEMISTRY OF MATERIALS   19 ( 13 )   3260 - 3264   2007.6

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    DOI： 10.1021/cm070321a

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  • Crystal structure and electron density of alpha-silicon nitride: Experimental and theoretical evidence for the covalent bonding and charge transfer Reviewed

    Masatomo Yashima, Yoshiaki Ando, Yasunori Tabira

    JOURNAL OF PHYSICAL CHEMISTRY B   111 ( 14 )   3609 - 3613   2007.4

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  • In situ transmission electron microscopy observation of multiple phase transition in BaGd2Mn2O7 Reviewed

    Hiromi Nakano, Nobuo Ishizawa, Naoki Kamegashira, Masatomo Yashima

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   90 ( 4 )   1342 - 1345   2007.4

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    DOI： 10.1111/j.1551-2916.2006.01314.x

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  • Problems and Future of the Materials Relating to Environment of the Earth

    HAYASHI Koichi, YASHIMA Masatomo

    Materia Japan   46 ( 3 )   151 - 151   2007.3

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    DOI： 10.2320/materia.46.151

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  • Crystal structure and electron density of tantalum oxynitride, a visible light responsive photocatalyst Reviewed

    Masatomo Yashima, Yungi Lee, Kazunari Domen

    CHEMISTRY OF MATERIALS   19 ( 3 )   588 - 593   2007.2

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    DOI： 10.1021/cm062586f

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  • Crystal structure and optical properties of (Ga1-xZnx)(N1-xOx) oxynitride photocatalyst (x = 0.13) (vol 416, pg 225, 2005) Reviewed

    Masatomo Yashima, Kazuhiko Maeda, Kentaro Teramura, Tsuyoshi Takata, Kazunari Domen

    CHEMICAL PHYSICS LETTERS   433 ( 4-6 )   454 - 454   2007.1

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  • Determination of precise unit-cell parameters of the alpha-tricalcium phosphate Ca-3(PO4)(2) through high-resolution synchrotron powder diffraction Reviewed

    Masatomo Yashima, Yoichi Kawaike, Masahiko Tanaka

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   90 ( 1 )   272 - 274   2007.1

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    DOI： 10.1111/j.1551-2916.2006.01375.x

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  • Zinc germanium oxynitride as a photocatalyst for overall water splitting under visible light Reviewed

    Yungi Lee, Hiroaki Terashima, Yoshiki Shimodaira, Kentaro Teramura, Michikazu Hara, Hisayoshi Kobayashi, Kazunari Domen, Masatomo Yashima

    JOURNAL OF PHYSICAL CHEMISTRY C   111 ( 2 )   1042 - 1048   2007.1

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    DOI： 10.1021/jp0656532

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  • Crystal structure, electron density distribution and diffusion path of Cu ions in copper iodide CuI

    Yashima Masatomo, Xu Qi, Yoshiasa Akira, Wada Satoshi

    Preprints of Annual Meeting of The Ceramic Society of Japan<br>Preprints of Fall Meeting of The Ceramic Society of Japan   2007 ( 0 )   112 - 112   2007

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    The crystal structure of copper iodide (CuI) has been studied at 300 K and 760 K using synchrotron X-ray powder diffraction data. An accurate electron density distribution of CuI has been obtained analyzing the data with a combination of the Rietveld method, a maximum-entropy method (MEM) and MEM-based pattern fitting. The MEM electron-density map of the zinc-blende type -CuI at 300 K indicated that the copper ions are located at the regular 4c position. It was found that the fluorite-type -CuI at 760 K has a large spatial distribution of copper ions along the <111> directions around the regular 8c position and diffusion pathway of mobile copper ions along the <100> direction. These features are responsible for the high ionic conductivity of -CuI. The electron-density maps of CuI at 300 K and 760 K also show covalent bonding between the copper and iodine atoms.

    DOI： 10.14853/pcersj.2007S.0.112.0

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  • Positional disorder and diffusion path of oxide ions in the yttria-doped ceria Ce0.93Y0.07O1.96 Reviewed

    Masatomo Yashima, Syuuhei Kobayashi, Tadashi Yasui

    FARADAY DISCUSSIONS   134   369 - 376   2007

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    DOI： 10.1039/b601806h

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  • Problems and Future of the Materials Relating to Environment of the Earth

    Hayashi Koichi, Yashima Masatomo

    Materia Japan   46 ( 3 )   151 - 151   2007

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    DOI： 10.2320/materia.46.151

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  • Structural Analysis of Ceramic Materials by Neutron Diffractometry

    YASHIMA Masatomo

    Ceramics Japan   41 ( 12 )   1014 - 1019   2006.12

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  • Neutron powder diffraction study of a phase transition in La-0.68(Ti0.95Al0.05)O-3 Reviewed

    Roushown Ali, Fujio Izumi, Masatomo Yashima

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   89 ( 12 )   3805 - 3811   2006.12

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    DOI： 10.1111/j.1551-2916.01324.x

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  • A compact furnace for synchrotron powder diffraction experiments up to 1800 K

    M Yashima, K Oh-uchi, M Tanaka, T Ida

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   89 ( 4 )   1395 - 1399   2006.4

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    DOI： 10.1111/j.1551-2916.2005.00865.x

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  • Size effect of dielectric properties for barium titnate particles and its model using two factors

    Satoshi Wada, Takuya Hoshina, Hiroaki Yasuno, Masanori Ohishi, Hirofumi Kakemoto, Takaaki Tsurumi, Masatomo Yashima

    Ceramic Transactions   174   15 - 26   2006.3

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  • Size and temperature induced phase transition behaviors of barium titanate nanoparticles

    T Hoshina, H Kakemoto, T Tsurumi, S Wada, M Yashima

    JOURNAL OF APPLIED PHYSICS   99 ( 5 )   2006.3

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    DOI： 10.1063/1.2179971

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  • Disorder- and Random-System in Crystallography (Structure Analysis of Disordered Crystal, Superionic Conductor, Amorphous, Glass and Melt)

    YOSHIASA Akira, SUGIYAMA Kazumasa, YASHIMA Masatomo, TAKATA Masaki

    Nihon Kessho Gakkaishi   48 ( 1 )   2 - 2   2006.2

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    DOI： 10.5940/jcrsj.48.2

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  • Disorder and Diffusion Path of Mobile Ions in Ionic Conductors : Neutron Diffraction Studies

    YASHIMA Masatomo

    Nihon Kessho Gakkaishi   48 ( 1 )   25 - 29   2006.2

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    We review our recent works on the positional disorder and diffusion path of mobile ions in fast ionic conductors Bi&lt;SUB&gt;1.4&lt;/SUB&gt;Yb&lt;SUB&gt;0.6&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt;and La&lt;SUB&gt;0.67&lt;/SUB&gt;Li&lt;SUB&gt;0.16&lt;/SUB&gt;TiO&lt;SUB&gt;3&lt;/SUB&gt;. These were studied through the nuclear density distribution obtained by a combined technique including the Rietveld refinement, the maximum-entropy method (MEM) and MEM-based pattern fitting of neutron powder diffraction data. The oxide ions in the fluorite-structured Bi&lt;SUB&gt;1.4&lt;/SUB&gt;Yb&lt;SUB&gt;0.6&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt;have a complicated disorder spreading over a wide area, shift to the &amp;lsaquo;111&amp;rsaquo; directions from the ideal fluorite position and diffuse along the &amp;lsaquo;100&amp;rsaquo; directions. At 77 K, the Li cations in the La&lt;SUB&gt;0.62&lt;/SUB&gt;Li&lt;SUB&gt;0.16&lt;/SUB&gt;TiO&lt;SUB&gt;3&lt;/SUB&gt;perovskite are located at the 2&lt;I&gt;c&lt;/I&gt;site (Wycoff notation of the&lt;I&gt;Cmmm&lt;/I&gt;space group) on the (002) La deficient layer, while at room temperature, they spread over a wide area and migrate following the 2&lt;I&gt;c&lt;/I&gt;-4&lt;I&gt;f&lt;/I&gt;-2&lt;I&gt;c&lt;/I&gt;or 2&lt;I&gt;c&lt;/I&gt;-2&lt;I&gt;d&lt;/I&gt;-2&lt;I&gt;c&lt;/I&gt;tie line on the (002) layer.

    DOI： 10.5940/jcrsj.48.25

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  • Crystal structure analysis of (Ga0.93Zn0.07)(N0.9O0.10) oxynitride photocatalyst

    M Yashima, K Maeda, K Teramura, T Takata, K Domen

    MATERIALS TRANSACTIONS   47 ( 2 )   295 - 297   2006.2

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    DOI： 10.2320/matertrans.47.295

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  • Structures and the oxygen deficiency of tetragonal and monoclinic zirconium oxide nanoparticles

    M Yashima, S Tsunekawa

    ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE   62   161 - 164   2006.2

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    DOI： 10.1107/S0108768105030570

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  • Crystal structure and the structural disorder of ceria from 40 to 1497 degrees C

    M Yashima, S Kobayashi, T Yasui

    SOLID STATE IONICS   177 ( 3-4 )   211 - 215   2006.1

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    DOI： 10.1016/j.ssi.2005.10.033

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  • Size effect of dielectric properties for barium titanate particles and its model

    S Wada, T Hoshina, H Yasuno, M Ohishi, H Kakemoto, T Tsurumi, M Yashima

    ELECTROCERAMICS IN JAPAN VIII   301   27 - 30   2006

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    DOI： 10.4028/0-87849-982-2.27

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  • Phase transition behavior of barium titanate nanoparticles Reviewed

    Takuya Hoshina, Hirofumi Kakemoto, Takaaki Tsurumi, Masatomo Yashima, Yoshihiro Kuroiwa, Satoshi Wada

    ELECTROCERAMICS IN JAPAN IX   320   131 - 134   2006

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    DOI： 10.4028/www.scientific.net/KEM.320.131

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  • Crystal structure, electron density and diffusion path of the fast-ion conductor copper iodide CuI Reviewed

    Masatomo Yashima, Qi Xu, Akira Yoshiasa, Satoshi Wada

    JOURNAL OF MATERIALS CHEMISTRY   16 ( 45 )   4393 - 4396   2006

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    DOI： 10.1039/b610127e

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  • Analysis of composite structures on barium titanate fine particles using synchrotron radiation

    T Hoshina, H Kakemoto, T Tsurumi, S Wada, M Yashima, K Kato, M Takata

    ELECTROCERAMICS IN JAPAN VIII   301   239 - 242   2006

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    DOI： 10.4028/0-87849-982-2.239

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  • クリスタリット

    坂田 修身, 乾 雅祝, 大高 理, 木原 國昭, 大嶋 建一, 石沢 伸夫, 八島 正知, 川路 均, 道上 勇一, 野上 由夫, 福永 俊晴

    日本結晶学会誌   48 ( 1 )   92 - 96   2006

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    DOI： 10.5940/jcrsj.48.92

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  • Investigation on strengthening and toughening mechanisms of Ce-TZP/Al2O3 nanocomposites

    Gang Yang, Jun-Chu Li, Gao-Chao Wang, Masatomo Yashima, Si-Lin Min, Tong-Cai Chen

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   37 ( 6 )   1969 - 1975   2006

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    DOI： 10.1007/s11661-006-0139-2

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  • Influences of ZrO2 nanoparticles on the microstructure and mechanical behavior of Ce-TZP/Al2O3 nanocomposites

    G Yang, JC Li, GC Wang, M Yashima, SL Min

    JOURNAL OF MATERIALS SCIENCE   40 ( 23 )   6087 - 6090   2005.12

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  • XAFS study of A-site-deficient La<inf>0.63</inf>Ti<inf>0.92</inf>Nb <inf>0.08</inf>O<inf>3</inf> perovskite Reviewed

    Akira Yoshiasa, Maki Okube, Hiroki Okudera, Akihiko Nakatsuka, Masatomo Yashima, Atsushi Sakai, Mizuki Mori, Roushown Ali

    Physica Scripta T   T115   372 - 374   2005.12

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  • Crystal structure and optical properties of (Ga1-xZnx)(N1-xOx) oxynitride photocatalyst (x=0.13)

    M Yashima, K Maeda, K Teramura, T Takata, K Domen

    CHEMICAL PHYSICS LETTERS   416 ( 4-6 )   225 - 228   2005.12

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    DOI： 10.1016/j.cplett.2005.09.092

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  • XPS study of the phase transition in pure zirconium oxide nanocrystallites

    S Tsunekawa, K Asami, S Ito, M Yashima, T Sugimoto

    APPLIED SURFACE SCIENCE   252 ( 5 )   1651 - 1656   2005.12

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    DOI： 10.1016/j.apsusc.2005.03.183

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  • Visualization of the diffusion path in the fast oxide-ion conductor Bi1.4Yb0.6O3

    M Yashima, D Ishimura

    APPLIED PHYSICS LETTERS   87 ( 22 )   1 - 3   2005.11

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    DOI： 10.1063/1.2137894

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  • A compact furnace for synchrotron powder diffraction measurements up to 1807 K

    M Yashima, M Tanaka, K Oh-uchi, T Ida

    JOURNAL OF APPLIED CRYSTALLOGRAPHY   38   854 - 855   2005.10

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    DOI： 10.1107/S0021889805020583

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  • Crystal structure of the high-temperature paraelectric phase in barium titanate BaTi2O5

    M Yashima, R Tu, T Goto, H Yamane

    APPLIED PHYSICS LETTERS   87 ( 10 )   2005.9

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    DOI： 10.1063/1.2042636

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  • Space group and crystal structure of the Perovskite CaTiO3 from 296 to 1720K

    R Ali, M Yashima

    JOURNAL OF SOLID STATE CHEMISTRY   178 ( 9 )   2867 - 2872   2005.9

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    DOI： 10.1016/j.jssc.2005.06.027

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  • Temperature dependence of lattice parameters and anisotropic thermal expansion of bismuth oxide

    M Yashima, D Ishimura, K Ohoyama

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   88 ( 8 )   2332 - 2335   2005.8

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    DOI： 10.1111/j.1551-2916.2005.00432.x

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  • Size effect on the crystal structure of barium titanate nanoparticles

    M Yashima, T Hoshina, D Ishimura, S Kobayashi, W Nakamura, T Tsurumi, S Wada

    JOURNAL OF APPLIED PHYSICS   98 ( 1 )   2005.7

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    DOI： 10.1063/1.1935132

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  • Unlubricated wear behavior of Ce-TZP/Al2O3 nanocomposites against bearing steel

    G Yang, JC Li, GC Wang, M Yashima, SL Min, TC Chen

    ADVANCED ENGINEERING MATERIALS   7 ( 3 )   133 - 136   2005.3

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    DOI： 10.1002/adem.200400190

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  • 高温中性子回折法による固体電解質材料の結晶構造とイオン伝導経路の研究

    八島 正知, 野村 勝裕

    電気化学および工業物理化学 : denki kagaku   73 ( 1 )   71 - 76   2005.1

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  • Size dependence of dielectric properties for nm-sized barium titanate crystallites and its origin

    S Wada, T Hoshina, H Yasuno, SM Nam, H Kakemoto, T Tsurumi, M Yashima

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   46 ( 1 )   303 - 307   2005.1

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  • Development of a Furnace for High-Resolution Synchrotron Powder Diffraction Measurements

    YASHIMA Masatomo, TANAKA Masahiko

    Nihon Kessho Gakkaishi   47 ( 4 )   281 - 284   2005

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    Accurate crystal structural analysis at high temperatures is of vital importance in various fields of science and engineering. A new electric furnace has been designed and fabricated to collect the high-resolution synchrotron radiation powder diffraction data from materials at high temperatures up to 1900 K in air (Yashima and Tanaka: &lt;I&gt;J. Appl. Cryst.&lt;/I&gt; 37, 786 (2004) ) . We demonstrate that the present new furnace enables accurate determination of crystal structure and electron density distribution of the cubic calcium titanate perovskite at 1674 K in air.

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  • DIELECTRIC PROPERTIES OF NM-SIZED BARIUM TITANATE FINE PARTICLES AND THEIR SIZE DEPENDENCE Reviewed

    Satoshi Wada, Takuya Hoshina, Hiroaki Yasuno, Masanori Ohishi, Hirofumi Kakemoto, Takaaki Tsurumi, Masatomo Yashima

    ADVANCES IN ELECTRONIC CERAMIC MATERIALS   26 ( 5 )   89 - 100   2005

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  • Disorder, diffusion path and phase transformation of ionic conductors in ceramic systems Reviewed

    Masatomo Yashima

    SOLID-SOLID PHASE TRANSFORMATIONS IN INORGANIC MATERIAL 2005, VOL 2   1041 - 1048   2005

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  • (Invited) Precise structural analysis through high-temperature neutron and synchrotron powder diffractometry Reviewed

    Masatomo Yashima

    Solid-Solid Phase Transformations in Inorganic Material 2005, Vol 2   493 - 502   2005

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  • XAFS study of the perovskite-type proton conductor SrZr0.9Yb0.1O3-delta Reviewed

    Maki Okube, Akira Yoshiasa, Masatomo Yashima, Kentaro Ohuchi, Taijyu Ishimura, Chiya Numako, Kichiro Koto

    PHYSICA SCRIPTA   T115   375 - 377   2005

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    DOI： 10.1238/Physica.Topical.115a00375

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  • XAFS study of the perovskite-type proton conductor SrZr 0.9Yb0.1O3-δ Reviewed

    Maki Okube, Akira Yoshiasa, Masatomo Yashima, Kentaro Ohuchi, Taijyu Ishimura, Chiya Numako, Kichiro Koto

    Physica Scripta T   T115   375 - 377   2005

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  • Temperature dependence of local structure in SrZr0.9Yb0.1O3-d

    Yoshiasa Akira, Okube Maki, Yashima Masatomo, Sasaki Satosi, Numako chiya, Koto Kichiro

    Preprints of Annual Meeting of The Ceramic Society of Japan<br>Preprints of Fall Meeting of The Ceramic Society of Japan   2005 ( 0 )   210 - 210   2005

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  • XAFS study of A-site-deficient La0.63Ti0.92Nb0.08O3 perovskite Reviewed

    Akira Yoshiasa, Maki Okube, Hiroki Okudera, Akihiko Nakatsuka, Masatomo Yashima, Atsushi Sakai, Mizuki Mori, Roushown Ali

    PHYSICA SCRIPTA   T115   372 - 374   2005

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  • A peculiar character of perovskite-type proton conductor SrZr1-xYbxO3 as an analogue of the lower mantle forming MgSiO3

    Okube Maki, Yoshiasa Akira, Sasaki Satosi, Yashima Masatomo, Ouchi Kennjirou, Numako Chiya, Koto Kichiro

    Abstracts for Annual Meeting of the Mineralogical Society of Japan   2005   113 - 113   2005

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    DOI： 10.14824/kobutsu.2005.0.113.0

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  • Origin of high dielectric properties of NM-sized barium titanate crystallites

    S Wada, T Hoshina, H Yasuno, SM Nam, H Kakemoto, T Tsurumi, M Yashima

    DEVELOPMENTS IN DIELECTRIC MATERIALS AND ELECTRONIC DEVICES   167   189 - 211   2005

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  • Performance of a new furnace for high-resolution synchrotron powder diffraction up to 1900 K: application to determine electron density distribution of the cubic CaTiO3 perovskite at 1674 K

    M Yashima, M Tanaka

    JOURNAL OF APPLIED CRYSTALLOGRAPHY   37   786 - 790   2004.10

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    DOI： 10.1107/S002188980401698X

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  • Disorder and Diffusion Path of Oxide Ions in Ion Conductors

    YASHIMA Masatomo

    Nihon Kessho Gakkaishi   46 ( 3 )   232 - 237   2004.6

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    We review our recent works on the positional disorder and diffusion path of oxide ions in Bi&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt;, CeO&lt;SUB&gt;2&lt;/SUB&gt; and (La&lt;SUB&gt;0.8&lt;/SUB&gt;Sr&lt;SUB&gt;0.2&lt;/SUB&gt;) (Ga&lt;SUB&gt;0.8&lt;/SUB&gt;Mg&lt;SUB&gt;0.15&lt;/SUB&gt;Co&lt;SUB&gt;0.05&lt;/SUB&gt;) O&lt;SUB&gt;3-&amp;delta;&lt;/SUB&gt;. These were studied through the nuclear density distribution obtained by a combined technique including a Rietveld refinement, a maximumentropy method (MEM) and MEM-based pattern fitting of the neutron powder diffraction data measured at high temperatures. Oxide ions in fluorite-type structured &amp;delta;-Bi&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt; and CeO&lt;SUB&gt;2&lt;/SUB&gt; have a complicated disorder spreading over a wide area and shift to the &amp;lsaquo;111&amp;rsaquo; directions from the ideal fluorite site at higher temperatures. Diffusion path of oxide ions in (La&lt;SUB&gt;0.8&lt;/SUB&gt;Sr&lt;SUB&gt;0.2&lt;/SUB&gt;) (Ga&lt;SUB&gt;0.8&lt;/SUB&gt;Mg&lt;SUB&gt;0.15&lt;/SUB&gt;Co&lt;SUB&gt;0.05&lt;/SUB&gt;) O&lt;SUB&gt;3-&amp;delta;&lt;/SUB&gt; perovskite is not along the straight line between the ideal positions, but exhibits an arc shape away from the B-site cation (Ga&lt;SUB&gt;0.8&lt;/SUB&gt;Mg&lt;SUB&gt;0.15&lt;/SUB&gt;Co&lt;SUB&gt;0.05&lt;/SUB&gt;) .

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  • イオン伝導体における酸化物イオンの分布と伝導経路--燃料電池材料への応用 (特集:燃料電池材料と材料開発)

    八島 正知

    月刊エコインダストリー   9 ( 4 )   23 - 28,69〜70   2004.4

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  • Positional disorder of oxygen ions in ceria at high temperatures

    M Yashima, S Kobayashi

    APPLIED PHYSICS LETTERS   84 ( 4 )   526 - 528   2004.1

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    DOI： 10.1063/1.1644053

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  • 基礎講座 固体酸化物燃料電池材料の結晶相の評価:基礎と応用

    八島 正知

    燃料電池   4 ( 2 )   89 - 94,図巻頭1p   2004

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  • The microstructure and mechanical behavior evaluation of Ce-TZP/Al2O3 nanocomposites

    G Yang, JC Li, GC Wang, M Yashima, SL Ming, JL Yu

    14TH CONGRESS OF INTERNATIONAL FEDERATION FOR HEAT TREATMENT AND SURFACE ENGINEERING, VOLS 1 and 2, PROCEEDINGS   25   139 - 142   2004

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  • A new furnace for high-temperature synchrotron X-ray powder diffraction experiments - Electron density analysis by powder X-ray diffraction at 1300 degrees C

    M Tanaka, M Yashima, T Mori

    SYNCHROTRON RADIATION INSTRUMENTATION   705   1055 - 1058   2004

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    DOI： 10.1063/1.1757979

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  • クリスタリット

    箱嶋 敏雄, 柴田 直樹, 松畑 洋文, 八島 正知, 安達 宏昭

    日本結晶学会誌   46 ( 3 )   247 - 248   2004

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    DOI： 10.5940/jcrsj.46.247

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  • Structural phase transitions of Yb2O3-doped strontium zircotate

    Ohuchi Kenjiro, Kageyama Hiroyuki, Yashima Masatomo, Ishimura Daiju, Tanaka Masahiko, Mori Takeharu, Yoshiasa Akira, Okube Maki, Sugawara Masahiko, Nomura Katsuhiro

    Preprints of Annual Meeting of The Ceramic Society of Japan<br>Preprints of Fall Meeting of The Ceramic Society of Japan   2004 ( 0 )   84 - 84   2004

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    DOI： 10.14853/pcersj.2004F.0.84.0

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  • New Frontiers of Materials Science and Engineering by the J-PARC Neutron Powder Diffractometers

    Yashima Masatomo

    hamon   14 ( 1 )   17 - 21   2004

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    New frontiers by the new neutron powder diffractometers in the JSNS/J-PARC facility have beendiscussed on the basis of the research works by the author and coworkers. The versatile new powder diffractometer SuperSirius should contribute to all the scientists and engineers in materials science and engineering with the help of supporting staffs. A very high-resolution neutron powder diffractometer can open new frontiers of materials science and engineering, because very small split of peaks with similar positions can be detectable, leading to considerable improvement of the accuracy of crystal parameters and phase transition temperature. Developments of the MEM analysis for the TOF neutron powder diffraction data are required. Short wavelength angle-dispersive type diffractometer is also necessary.

    DOI： 10.5611/hamon.14.17

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  • Structure and catalytic properties of nanosized alumina supported platinum and palladium particles synthesized by reaction in microemulsion

    M Yashima, LKL Falk, AEC Palmqvist, K Holmberg

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   268 ( 2 )   348 - 356   2003.12

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    DOI： 10.1016/j.jcis.2003.07.041

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  • Conduction path and disorder in the fast oxide-ion conductor (La0.8Sr0.2)(Ga0.8Mg0.15Co0.05)O-2.8

    M Yashima, K Nomura, H Kageyama, Y Miyazaki, N Chitose, K Adachi

    CHEMICAL PHYSICS LETTERS   380 ( 3-4 )   391 - 396   2003.10

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    DOI： 10.1016/j,cplett.2003.08.121

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  • Crystal structure and disorder of the fast oxide-ion conductor cubic Bi2O3

    M Yashima, D Ishimura

    CHEMICAL PHYSICS LETTERS   378 ( 3-4 )   395 - 399   2003.9

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    DOI： 10.1016/j.cplett.2003.07.014

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  • High-temperature phase transition in lanthanum titanate perovskite La-0.64(Ti-0.92,Nb-0.08)O-3

    M Yashima, M Mori, T Kamiyama, K Oikawa, A Hoshikawa, S Torii, K Saitoh, K Tsuda

    CHEMICAL PHYSICS LETTERS   375 ( 1-2 )   240 - 246   2003.6

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    DOI： 10.1016/S0009-2614(03)00835-2

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  • Lattice parameters and structural phase transition of lanthanum titanate perovskite, La-0.68(Ti-0.95,Al-0.05)O-3

    R Ali, M Yashima

    JOURNAL OF SYNCHROTRON RADIATION   10   228 - 232   2003.5

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    DOI： 10.1107/S0909049503002504

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  • High-temperature neutron powder diffraction study of the structural phase transition between alpha and alpha ' phases in tricalcium phosphate Ca-3(PO4)(2)

    M Yashima, A Sakai

    CHEMICAL PHYSICS LETTERS   372 ( 5-6 )   779 - 783   2003.5

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    DOI： 10.1016/S0009-2614(03)00505-0

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  • High-temperature neutron powder diffraction study of cerium dioxide CeO2 up to 1770 K

    M Yashima, D Ishimura, Y Yamaguchi, K Ohoyama, K Kawachi

    CHEMICAL PHYSICS LETTERS   372 ( 5-6 )   784 - 787   2003.5

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    DOI： 10.1016/S0009-2614(03)00507-4

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  • セリア-ジルコニア系状態図と固溶体 (特集 排ガス浄化触媒用セリア・ジルコニア固溶体の新展開)

    八島 正知

    マテリアルインテグレ-ション   16 ( 4 )   15 - 19   2003.4

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  • Dependence of the accuracy of a continuous phase transition temperature on angular resolution in powder diffractometry

    M Yashima, M Mori, R Ali, M Tanaka, T Mori

    CHEMICAL PHYSICS LETTERS   371 ( 5-6 )   582 - 587   2003.4

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    DOI： 10.1016/S0009-2614(03)00325-7

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  • Synthesis and powder diffraction analysis of tri-rubidium penta-tantalum oxide, Rb3Ta5O14, with novel three-dimensionally nanostructured Rb-bearing channels

    A Oono, M Yashima, D du Boulay, N Ishizawa, A Saiki, S Oishi

    POWDER DIFFRACTION   18 ( 1 )   2 - 6   2003.3

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    DOI： 10.1154/1.1545114

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  • High-Temperature Structural Phase Transitions in Strontium Zirconate

    OH-UCHI Kenjiro, OKUBE Maki, YASHIMA Masatomo, SAKAI Atsushi, MORI Mizuki, ISHIMURA Daiju, TANAKA Masahiko, OHOYAMA Kenji, MORI Takeharu, YOSHIASA Akira

    Preprints of Annual Meeting of The Ceramic Society of Japan<br>Preprints of Fall Meeting of The Ceramic Society of Japan   2003 ( 0 )   1021 - 1021   2003

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    We have investigated in situ the phase transitions of the strontium zirconate by neutron and high-resolution synchrotron radiation powder diffraction techniques. The unit-cell and structural parameters were refined by the Rietveld method. The sequence of existing phases was confirmed to be Pnma (orthorhombic), Imma (orthorhombic), I4/mcm (tetragonal) and Pm-3m (cubic). The results indicated that the transitions from Pnma to Imma and from I4/mcm to Pm-3m are continuous. The Imma and I4/mcm phases coexisted at 1149K, indicating that the Imma-I4/mcm phase transition is of first order. The tilt angle of ZrO6 octahedron in Pnma, Imma and I4/mcm decreased with increasing temperature. The tilt angle of ZrO6 octahedron in the tetragonal phase is taken to be the order parameter and its temperature variation is consistent with a tricritical phase transition.

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  • Local Structure of perovskite-type proton conductor SrZr0.9Yb0.1O3-&delta;

    Okube Maki, Yoshiasa Akira, Yoshima Masatomo, Numako Chiya, Koto Kichiro

    Abstracts for Annual Meeting of the Mineralogical Society of Japan   2003 ( 0 )   25 - 25   2003

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    Perovskite-type oxides such as Ln3+ doped SrCeO3 and BaCeO3 where Ln3+ represents trivalent lanthanide elements, have been found to exhibit appreciable proton conduction in hydrogen-containing atmosphere at high temperature. Among these, the chemical stability of SrZrO3-based oxide is much better, and Yb-doped SrZrO3 oxide shows the highest proton conductivity. The proton conductivity depends on the amount of dopant Yb ions and shows the maximum value when substituted for Yb ions by 10mol%. The oxide ion vacancies and/or electron holes are produced by substitution of tetravalent zirconium ions by trivalent ytterbium ions. In our previous studies, the mass loss and gain of oxygen in the Yb-doped SrZrO3 was observed in heating and cooling process, respectively.In this study, temperature dependence of XAFS spectra of Perovskite-type proton conductor SrZr0.9Yb0.1O3-&delta; at Sr and Zr K-edges and Yb L3, L2 and L1-edges have been investigated. The chemical shift to lower energy and change in XANES spectra are observed with increasing temperature. No change in XANES spectra and in threshold energies of the Yb L3-, L2- and L1-edge was observed. This indicates that the effective charges (oxidation states) of Sr and Zr ions change with the oxygen loss while the effective charge of Yb ion were maintained. The unit cell volumes increase with increasing temperature with a slight bent between 700 and 950 K. This bent of the unit cell volumes vs. temperature is considered to be due to loss of oxygen, which is consistent with the result of a weight loss in TGA observed in the same temperature range. The mean-square relative displacements (MSRD) of the backscattering atoms with respect to the absorbing atom were also determined by EXAFS. Its temperature dependence increases with a slight bent between 700 and 950 K, which is considered to be due to a local structure change accompanied by the loss of oxygen rather than that by the phase transition at 948 K. It is considered that the changes of local structures and effective charges of Sr and Zr ions must play an important role in the protonic conductivity.

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  • Local Structure and chemical bonding in La0.63Ti0.92Nb0.08O3 with A-site-deficient perovskite-type structure

    Yoshiasa Akira, Okube Maki, Yoshima Masatomo, ALI Roushown

    Abstracts for Annual Meeting of the Mineralogical Society of Japan   2003 ( 0 )   28 - 28   2003

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    Publisher：Japan Association of Mineralogical Sciences  

    La2/3TiO3-based compounds with an A-site-deficient perovskite-type ABO3 structure exhibit high ionic conductivities and dielectric constants. The orthorhombic (Cmmm) - tetragonal (P4/mmm) phase transition occurs reversibly and continuously at 623(2) K in the La0.63Ti0.92Nb0.08O3. Cation vacancies in the compounds are ordered in a lattice site at lower temperature. The temperature dependence of EXAFS Debye-Waller factors in La0.63Ti0.92Nb0.08O3 perovskite with cation deficiency was investigated with the cumulant expansion method. The measurements of the Ti and Nb K-edge and La L3-edge EXAFS spectra were carried out in the transmission mode at temperature up to 800 K. The obtained local bond distances of 1.95(1) A for Ti-O, 1.98(1) A for Nb-O and 2.65(1) A for La-O are significantly smaller than the expected values on the Shannon's radii. This characteristic is attributable to the presence of the cation deficiency. The effective pair potentials, V(u)=au2/2+bu3/3!, were evaluated and the potential coefficients a and b for the Ti-O bond in La0.63Ti0.92Nb0.08O3 are 6.6(1) eV/A2 and -42(3) eV/A3, respectively. The Ti-O bond in the A-site-deficient La0.63Ti0.92Nb0.08O3 has relatively larger anharmonic and soft potential coefficient than that in ordinary CaTiO3 perovskites.

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  • In situ observations of phase transition using high-temperature neutron and synchrotron X-ray powder diffractometry

    M Yashima

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   85 ( 12 )   2925 - 2930   2002.12

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    DOI： 10.1111/j.1151-2916.2002.tb00557.x

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  • High-temperature synchrotron X-ray powder diffraction study of the orthorhombic-tetragonal phase transition in lanthanum titanate perovskite La-0.68(Ti-0.95,Al-0.05)O-3

    M Yashima, R Ali, M Tanaka, T Mori

    CHEMICAL PHYSICS LETTERS   363 ( 1-2 )   129 - 133   2002.9

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    DOI： 10.1016/S0009-2614(02)01204-6

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  • Application of the CALPHAD Method on Ceramic Systems

    YASHIMA Masatomo

    Ceramics Japan   37 ( 7 )   509 - 515   2002.7

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  • beta-cubic phase transition of scandia-doped zirconia solid solution: Calorimetry, x-ray diffraction, and Raman scattering

    H Fujimori, M Yashima, M Kakihana, M Yoshimura

    JOURNAL OF APPLIED PHYSICS   91 ( 10 )   6493 - 6498   2002.5

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    DOI： 10.1063/1.1471576

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  • Design and Fabricaion of a Furnace for High-Temperature Neutron Powder Diffraction Measurements, and Structural Study of Ceramic Materials

    YASHIMA Masatomo

    Journal of the Crystallographic Society of Japan   44 ( 2 )   121 - 126   2002.4

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    We have designed and fabricated a new furnace for high-temperature neutron-diffraction measurements. The furnace does not yield any extra peaks due to heaters and refractory, thus we were able to measure very small neutron signals from the sample. Quality neutron diffraction data at high temperatures up to about 1590 &amp;deg;C were analyzed by Rietveld method for various materials as zirconia and calcium titanate.

    DOI： 10.5940/jcrsj.44.121

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  • ABC(6) type ordered structure in Pt-rich Pt-Mn alloys

    M Takahashi, T Sembiring, M Yashima, T Shishido, K Ohshima

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 3 )   681 - 684   2002.3

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    DOI： 10.1143/JPSJ.71.681

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  • High-temperature synchrotron X-ray powder diffraction study of the orthorhombic-tetragonal phase transition in La-0.63(Ti-0.92,Nb-0.08)O-3

    R Ali, M Yashima, M Tanaka, H Yoshioka, T Mori, S Sasaki

    JOURNAL OF SOLID STATE CHEMISTRY   164 ( 1 )   51 - 59   2002.2

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    DOI： 10.1006/jssc.2001.9447

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  • クリスタリット

    高倉 洋礼, 八島 正知, 松井 良夫

    日本結晶学会誌   44 ( 2 )   137 - 138   2002

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    DOI： 10.5940/jcrsj.44.137

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  • Local structures in perovskite-type compounds and peculiar effective pair potentials

    YOSHIASA Akira, OKUBE Maki, OKUDERA Hiroki, YASHIMA Masatomo

    Abstracts for Annual Meeting of the Mineralogical Society of Japan   2002 ( 0 )   88 - 88   2002

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    DOI： 10.14824/kobutsu.2002.0.88.0

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  • Cubic-tetragonal phase change of yttria-doped hafnia solid solution: high-resolution X-ray diffraction and Raman scattering

    H Fujimori, M Yashima, S Sasaki, M Kakihana, T Mori, M Tanaka, M Yoshimura

    CHEMICAL PHYSICS LETTERS   346 ( 3-4 )   217 - 223   2001.10

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    DOI： 10.1016/S0009-2614(01)00929-0

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  • A differential scanning calorimeter study of the monoclinic (P2(1)/b) &lt;-&gt; hexagonal (P6(3)/m) reversible phase transition in hydroxyapatite

    H Takahashi, M Yashima, M Kakihana, M Yoshimura

    THERMOCHIMICA ACTA   371 ( 1-2 )   53 - 56   2001.4

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    DOI： 10.1016/S0040-6031(01)00431-2

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  • Study of phase change in inorganic compounds by synchrotron x-ray powder diffraction

    YASHIMA Masatomo, ALI Roushown, TANAKA Masahiko, MORI Takeharu, SASAKI Satoshi

    Japanese Magazine of Mineralogical and Petrological Sciences   30 ( 2 )   74 - 75   2001.3

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    DOI： 10.2465/gkk.30.74

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  • Crystal structure refinement of La-0.683(Ti0.95Al0.05)O-3 perovskite by the Rietveld method

    R Ali, M Yashima, M Yoshimura, H Yoshioka

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   84 ( 2 )   468 - 470   2001.2

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  • Study of phase change in inorganic compounds by synchrotron x-ray powder diffraction

    Masatomo Yashima, Roushown Ali, Masahiko Tanaka, Takeharu Mori, Satoshi Sasaki

    Japanese Magazine of Mineralogical and Petrological Sciences   30 ( 2 )   74 - 75   2001.1

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    DOI： 10.2465/gkk.30.74

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  • Internal distortion in ceria-doped hafnia solid solutions: High-resolution x-ray diffraction and Raman scattering

    Hirotaka Fujimori, Masatomo Yashima, Satoshi Sasaki, Masato Kakihana, Takeharu Mori, Masahiko Tanaka, Masahiro Yoshimura

    Physical Review B - Condensed Matter and Materials Physics   64 ( 13 )   2001

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    DOI： 10.1103/PhysRevB.64.134104

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  • In Situ Ultraviolet Raman Study on the Phase Transition of Hafnia up to 2085 K

    Hirotaka Fujimori, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Journal of the American Ceramic Society   84 ( 3 )   663 - 665   2001

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    DOI： 10.1111/j.1151-2916.2001.tb00721.x

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  • Active sites on ZrO2 for the formation of isobutene from CO and H-2

    K Maruya, T Komiya, T Hayakawa, LH Lu, M Yashima

    JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL   159 ( 1 )   97 - 102   2000.9

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    DOI： 10.1016/S1381-1169(00)00176-X

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  • Dependence of activity of ZrO<inf>2</inf>catalysts for isobutene formation in CO hydrogenation on the phase structure

    Ken Ichi Maruya, Teruaki Komiya, Masatomo Yashima

    Studies in Surface Science and Catalysis   130 D   3693 - 3698   2000.1

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  • High-temperature X-ray diffraction study of the lanthanum aluminium titanate perovskite La0.683Ti0.95Al0.05O3

    Masatomo Yashima, Roushown Ali, Hideki Yoshioka

    Solid State Ionics   128 ( 1-4 )   105 - 110   2000

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Science Publishers B.V.  

    DOI： 10.1016/S0167-2738(99)00345-8

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  • Phase transition and soft phonon modes in around by ultraviolet laser Raman spectroscopy

    Hirotaka Fujimori, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Physical Review B - Condensed Matter and Materials Physics   61 ( 6 )   3971 - 3974   2000

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    DOI： 10.1103/PhysRevB.61.3971

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  • Synthesis of metastable tetragonal (t′) ZrO<inf>2</inf>-12 mol% YO<inf>1.5</inf>by the organic polymerized complex method

    Osamu Yokota, Osamu Yokota, Masatomo Yashima, Masatomo Yashima, Masato Kakihana, Masato Kakihana, Akira Shimofuku, Masahiro Yoshimura, Masahiro Yoshimura

    Journal of the American Ceramic Society   82   1333 - 1335   1999.12

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  • Relation of active sites for the selective formation of isobutene from syngas and its basicity to the strucure of ZrO_2

    MARUYA Ken-ichi, KOMIYA Teruaki, HAYAKAWA Motoki, LU Lianhai, YASHIMA Masatomo

    触媒   41 ( 6 )   397 - 399   1999.9

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  • Spectroscopic characterization of precursors used in the pechini-type polymerizable complex processing of barium titanate

    Masato Kakihana, Momoko Arima, Yoshiyuki Nakamura, Masatomo Yashima, Masahiro Yoshimura

    Chemistry of Materials   11 ( 2 )   438 - 450   1999

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    DOI： 10.1021/cm9806681

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  • Linear relationship of the rate of isobutene formation from CO and H2 on ZrO2 to the monoclinic phase fraction

    Ken-Ichi Maruya, Teruaki Komiya, Koichiro Okumura, Masatomo Yashima

    Chemistry Letters   ( 7 )   575 - 576   1999

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    DOI： 10.1246/cl.1999.575

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  • Internal distortion in ZrO<inf>2</inf>-CeO<inf>2</inf>solid solutions: Neutron and high-resolution synchrotron x-ray diffraction study

    Masatomo Yashima, Satoshi Sasaki, Yasuo Yamaguchi, Masato Kakihana, Masahiro Yoshimura, Takeharu Mori

    Applied Physics Letters   72   182 - 184   1998.12

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  • Structural changes of scandia-doped zirconia solid solutions: Rietveld analysis and Raman scattering

    H Fujimori, M Yashima, M Kakihana, M Yoshimura

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   81 ( 11 )   2885 - 2893   1998.11

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  • Polymerized complex route to the synthesis of pure SrTiO3 at reduced temperatures: Implication for formation of Sr-Ti heterometallic citric acid complex

    M Kakihana, T Okubo, M Arima, Y Nakamura, M Yashima, M Yoshimura

    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY   12 ( 2 )   95 - 109   1998.10

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    DOI： 10.1023/A:1008613312025

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  • Preparation of tetragonal ZrO2-12mol%CeO2 and ZrO2-6mol%YO1.5 solid solutions at reduced temperature by a simple aqueous solution route using citric acid as a complexant

    M Kakihana, S Kato, M Yashima, M Yoshimura

    JOURNAL OF ALLOYS AND COMPOUNDS   280 ( 1-2 )   125 - 130   1998.10

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    DOI： 10.1016/S0925-8388(98)00716-6

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  • Phase diagram and oxygen-ion conductivity in the Y2O3-Nb2O5 system

    JH Lee, M Yashima, M Kakihana, M Yoshimura

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   81 ( 4 )   894 - 900   1998.4

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  • Ionic conductivity of fluorite-structured solid solution Y0.8Nb0.2O1.7

    JH Lee, M Yashima, M Yoshimura

    SOLID STATE IONICS   107 ( 1-2 )   47 - 51   1998.3

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  • 21世紀のセラミックス材料の研究開発と状態図

    八島 正知

    セラミックス   33 ( 1 )   21 - 21   1998.1

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  • Low-temperature synthesis of crystallized Ca1-xSrxTiO3 solid-solution films on titanium substrates by a modified hydrothermal-electrochemical technique

    M Yoshimura, O Asai, WS Cho, M Yashima, Y Suzuki, M Kakihana

    JOURNAL OF ALLOYS AND COMPOUNDS   265 ( 1-2 )   132 - 136   1998.1

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    DOI： 10.1016/S0925-8388(97)00304-6

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  • beta-rhenanite (beta-NaCaPO4) as weak interphase for hydroxyapatite ceramics

    W Suchanek, M Yashima, M Kakihana, M Yoshimura

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   18 ( 13 )   1923 - 1929   1998

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    DOI： 10.1016/S0955-2219(98)00131-9

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  • Synthesis of ZrO2-Y6WO12 solid solution powders by a polymerized complex method

    Junfeng Ma, Masahiro Yoshimura, Masato Kakihana, Masatomo Yashima

    Journal of Materials Research   13 ( 4 )   939 - 943   1998

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    DOI： 10.1557/JMR.1998.0130

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  • β-Rhenanite (β-NaCaPO<inf>4</inf>) as weak interface for hydroxyapatite ceramics

    Wojciech Suchanek, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Key Engineering Materials   2025 - 2028   1997.12

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  • Preparation and luminescence of crystallized Ba1-XSrXMoO4 solid-solution films by an electrochemical method at room temperature

    M Yoshimura, M Ohmura, WS Chol, M Yashima, M Kakihana

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   36 ( 9AB )   L1229 - L1231   1997.9

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  • Preparation of crystallized Sr1-xCaxMoO4 solid-solution films by an electrochemical method at room temperature and their luminescence

    M Yoshimura, M Ohmura, WS Cho, M Yashima, M Kakihana

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   80 ( 9 )   2464 - 2466   1997.9

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  • Formation of metastable fluorite phase by rapid quenching of melts in the Y2O3-Ta2O5 system

    O Yokota, M Yashima, N Yamamoto, M Yoshimura

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   80 ( 9 )   2429 - 2432   1997.9

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  • Hydroxyapatite ceramics with selected sintering additives

    W Suchanek, M Yashima, M Kakihana, M Yoshimura

    BIOMATERIALS   18 ( 13 )   923 - 933   1997.7

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    DOI： 10.1016/S0142-9612(97)00019-7

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  • Polymerized complex synthesis of perovskite lead titanate at reduced temperatures: Possible formation of heterometallic (Pb,Ti)-citric acid complex

    M Kakihana, T Okubo, M Arima, O Uchiyama, M Yashima, M Yoshimura, Y Nakamura

    CHEMISTRY OF MATERIALS   9 ( 2 )   451 - 456   1997.2

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    DOI： 10.1021/cm9602353

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  • Size and charge effects of dopant M on the unit-cell parameters of monoclinic zirconia solid solutions Zr(0.98)M(0.02)O(2-delta) (M=Ce,La,Nd,Sm,Y,Er,Yb,Sc,Mg,Ca)

    M Yashima, T Hirose, M Kakihana, Y Suzuki, M Yoshimura

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   80 ( 1 )   171 - 175   1997.1

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    DOI： 10.1111/j.1151-2916.1997.tb02806.x

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  • Hydroxyapatite/hydroxyapatite-whisker composites without sintering additives: Mechanical properties and microstructural evolution

    Wojciech Suchanek, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Journal of the American Ceramic Society   80 ( 11 )   2805 - 2813   1997

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    DOI： 10.1111/j.1151-2916.1997.tb03197.x

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  • Raman spectral characterization of existing phases in the Y2O3-Nb2O5 system

    Masatomo Yashima, Jin-Ho Lee, Masato Kakihana, Masahiro Yoshimura

    Journal of Physics and Chemistry of Solids   58 ( 10 )   1593 - 1597   1997

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    DOI： 10.1016/S0022-3697(97)00098-X

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  • Crystallization of hafnia and zirconia during the pyrolysis of of acetate gels

    Masatomo Yashima, Taka-Aki Kato, Masato Kakihana, Mehmet Ali Gulgun, Yohtaro Matsuo, Masahiro Yoshimura

    Journal of Materials Research   12 ( 10 )   2575 - 2583   1997

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    DOI： 10.1557/JMR.1997.0342

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  • Active electrochemical dissolution of molybdenum and application for room-temperature synthesis of crystallized luminescent calcium molybdate film

    Woo-Seok Cho, Masatomo Yashima, Masato Kakihana, Akihiko Kudo, Tadayoshi Sakata, Masahiro Yoshimura

    Journal of the American Ceramic Society   80 ( 3 )   765 - 769   1997

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    DOI： 10.1111/j.1151-2916.1997.tb02895.x

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  • Polymerized complex synthesis and the Raman scattering of Bi2.1Sr1.9-xLaxCuO6+d

    Atsuyoshi Inoue, Masato Kakihara, Minoru Osada, Shinjirou Tochihara, Hiroshi Yasuoka, Hiromasa Mazaki, Masatomo Yashima

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   44 ( 2 )   137 - 141   1997

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Funtai Funamtsu Yakin Kyokai/Japan Soc. of Powder Metallurgy  

    DOI： 10.2497/jjspm.44.137

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  • Polymerized complex synthesis and the Raman scattering of Bi2.1Sr1.9-xLaxCuO6+d

    Atsuyoshi Inoue, Masato Kakihara, Minoru Osada, Shinjirou Tochihara, Hiroshi Yasuoka, Hiromasa Mazaki, Masatomo Yashima

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   44 ( 2 )   137 - 141   1997

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  • Raman-active phonons in Bi2Sr2-xLaxCuO6+d - Phonon assignment and charge-redistribution effects- Reviewed

    M. Osada, M. Kakihana, M. Käll, L. Börjesson, A. Inoue, M. Yashima

    Phys. Rev. B   56   2847 - 2851   1997

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  • Change in phonon Raman spectra of Bi2Sr2Ca1-xYxCu2O8+d induced by hole filling and implications for phonon assignments

    M Osada, M Kakihana, M Kall, L Borjesson, M Yashima, M Yoshimura

    MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY   41 ( 1 )   107 - 110   1996.10

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    DOI： 10.1016/S0921-5107(96)01634-0

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  • Highly active BaTi4O9/RuO2 photocatalyst by polymerized complex method

    M Kakihana, M Arima, T Sato, K Yoshida, Y Yamashita, M Yashima, M Yoshimura

    APPLIED PHYSICS LETTERS   69 ( 14 )   2053 - 2055   1996.9

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    DOI： 10.1063/1.116877

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  • A simple solution route to the synthesis of pure La2Ti2O7 and Nd2Ti2O7 at 700-800 degrees C by polymerized complex method

    MM Milanova, M Kakihana, M Arima, M Yashima, M Yoshimura

    JOURNAL OF ALLOYS AND COMPOUNDS   242 ( 1-2 )   6 - 10   1996.9

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    DOI： 10.1016/0925-8388(96)02323-7

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  • ジルコニアの相変態 (特集 相変態現象)

    八島 正知, 垣花 真人, 吉村 昌弘

    金属   66 ( 3 )   203 - 216   1996.3

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  • Determination of tetragonal-cubic phase boundary of Zr(1-x)R(x)O(2-x/2) (R=Nd,Sm,Y,Er and Yb) by Raman scattering

    M Yashima, K Ohtake, M Kakihana, H Arashi, M Yoshimura

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   57 ( 1 )   17 - 24   1996.1

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    DOI： 10.1016/0022-3697(95)00085-2

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  • Room-temperature preparation of crystallized luminescent Sr1-xCaxWO4 solid-solution films by an electrochemical method

    Woo-Seok Cho, Masatomo Yashima, Masato Kakihana, Akihiko Kudo, Tadayoshi Sakata, Masahiro Yoshimura

    Applied Physics Letters   68 ( 1 )   137 - 139   1996

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    DOI： 10.1063/1.116781

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  • Hydroxyapatite/hydroxyapatite (whiskers) composites without sintering aids - Mechanical properties and microstructural evolution Reviewed

    W. Suchanek, M. Yashima, M. Kakihana, M. Yoshimura

    Bioceramics,   9   153 - 156   1996

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  • Raman active phonons in Bi2Sr2Ca1-xYxCu2O8+d (x=0-1): Effects of hole-filling and internal pressure induced by Y doping for Ca, and implications on phonon assignments Reviewed

    M. Kakihana, M. Osada, M. Käll, L. Börjesson, H. Mazaki, H. Yasuoka, M. Yashima, M. Yoshimura

    Phys. Rev. B   53   11796 - 11806   1996

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  • Oxygen disordering and charge transfer effect in YBa2-xSrxCu3O7-d

    Masato Kakihana, Minoru Osada, Susumu Katano, Hiromasa Mazaki, Hiroshi Yasuoka, Masatomo Yashima, Masahiro Yoshimura

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   43 ( 2 )   195 - 199   1996

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    DOI： 10.2497/jjspm.43.195

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  • Synthesis of metastable tetragonal (t′) zirconia-calcia solid solution by pyrolysis of organic precursors and coprecipitation route

    Masatomo Yashima, Masato Kakihana, Koutaroh Ishii, Yasuro Ikuma, Masahiro Yoshimura

    Journal of Materials Research   11 ( 6 )   1410 - 1420   1996

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    DOI： 10.1557/JMR.1996.0177

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  • Processing and mechanical properties of hydroxyapatite reinforced with hydroxyapatite whiskers

    Wojciech Suchanek, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Biomaterials   17 ( 17 )   1715 - 1723   1996

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Science Ltd  

    DOI： 10.1016/0142-9612(96)87652-6

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  • Measurement and calculation of the ZrO2-CeO2-LaO1.5phase diagram

    Yong Du, Masatomo Yashima, Toshiaki Koura, Masato Kakihana, Masahiro Yoshimura

    Calphad: Computer Coupling of Phase Diagrams and Thermochemistry   20 ( 1 )   95 - 108   1996

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Ltd  

    DOI： 10.1016/0364-5916(96)00017-X

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  • Thermodynamic assessment of the zirconia-urania system

    Masatomo Yashima, Toshiaki Koura, Yong Du, Masahiro Yoshimura

    Journal of the American Ceramic Society   79 ( 2 )   521 - 524   1996

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Ceramic Society  

    DOI： 10.1111/j.1151-2916.1996.tb08158.x

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  • Formation of metastable forms by quenching of the HfO2-RO1.5 melts (R = Gd, Y and Yb)

    Masatomo Yashima, Heishiro Takahashi, Katsuya Ohtake, Teruo Hirose, Masato Kakihana, Haruo Arashi, Yasuro Ikuma, Yasuo Suzuki, Masahiro Yoshimura

    Journal of Physics and Chemistry of Solids   57 ( 3 )   289 - 295   1996

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Ltd  

    DOI： 10.1016/0022-3697(95)00268-5

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  • Hydroxyapatite/bioactive glass laminated composite - Fracture behaviour and phase composition Reviewed

    W. Suchanek, M. Yashima, M. Kakihana, M. Yoshimura

    Bioceramics,   9   177 - 180   1996

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  • Polymerized complex route to barium titanate powders using barium-titanium mixed-metal citric acid complex

    Momoko Arima, Masato Kakihana, Yoshiyuki Nakamura, Masatomo Yashima, Masahiro Yoshimura

    Journal of the American Ceramic Society   79 ( 11 )   2847 - 2856   1996

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Ceramic Society  

    DOI： 10.1111/j.1151-2916.1996.tb08718.x

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  • Raman scattering of Ca-substituted YBa2Cu3O7-d synthesized by polymerized complex method

    Yoshiyuki Nasuno, Minoru Osada, Masato Kakihana, Hiroshi Yasuoka, Shinjirou Tochihara, Hiromasa Mazaki, Hirotaka Fujimori, Masatomo Yashima, Masahiro Yoshimura

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   43 ( 9 )   1065 - 1069   1996

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Funtai Funamtsu Yakin Kyokai/Japan Soc. of Powder Metallurgy  

    DOI： 10.2497/jjspm.43.1065

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  • Polymerized complex route to synthesis of pure Y2Ti2O7 at 750°C using yttrium-titanium mixed-metal citric acid complex

    Masato Kakihana, Maria M. Milanova, Momoko Arima, Toru Okubo, Masatomo Yashima, Masahiro Yoshimura

    Journal of the American Ceramic Society   79 ( 6 )   1673 - 1676   1996

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Ceramic Society  

    DOI： 10.1111/j.1151-2916.1996.tb08781.x

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  • Monoclinic ↔ hexagonal phase transition in hydroxyapatite studied by X-ray powder diffraction and differential scanning calorimeter techniques

    Hiroyuki Suda, Hiroyuki Suda, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Journal of Physical Chemistry   99   6752 - 6754   1995.12

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  • Room-temperature preparation of the highly crystallized luminescent CaWO4 film by an electrochemical method

    Woo Seok Cho, Masatomo Yashima, Masato Kakihana, Akihiko Kudo, Tadayoshi Sakata, Masahiro Yoshimura

    Applied Physics Letters   1027   1995.12

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  • FUNDAMENTAL AND HARMONIC SUSCEPTIBILITIES OF AN OXIDE SUPERCONDUCTOR SYNTHESIZED BY THE POLYMERIZED COMPLEX METHOD

    H MAZAKI, H YASUOKA, M KAKIHANA, H FUJIMORI, M YASHIMA, M YOSHIMURA

    PHYSICA C   252 ( 3-4 )   275 - 281   1995.10

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    DOI： 10.1016/0921-4534(95)00447-5

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  • Unit-Cell Parameters and Oxygen Displacement of Metastable HfO_2YO_<1.5> Solid Solutions

    YASHIMA Masatomo, HIROSE Teruo, KAKIHANA Masato, SUZUKI Yasuo, YOSHIMURA Masahiro

    Journal of the Ceramic Society of Japan   103 ( 1198 )   622 - 628   1995.6

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    Language：Japanese   Publisher：The Ceramic Society of Japan  

    HfO_2-X mol% YO_<1.5> solid solutions (X=0-22) were prepared by arc melting to investigate the compositional dependence of the unit-cell parameters of diffusion-lessly formed metastable phases through X-ray powder diffraction measurements at room temperature. Unit-cell parameters of monoclinic and tetragonal phases of HfO_2-X mol% YO_<1.5>(X=0, 2, 4, 5, 6, 7, 8 and 9) were refined by the Rietveld analysis. The lattice parameter and oxygen displacement were estimated for samples of X=10 to 22 by the profile-fitting technique. In the monoclinic phase(0&lnE;X&lnE;7), the lattice parameter a increased, while the b and the β angle decreased with an increase of YO_<1.5> content. In the tetragonal phase, the lattice parameter a increased (6&lnE;X<13), while the c and the axial ratio c/a_f decreased (7&lnE;X<13) with increasing of YO_<1.5> content, and then a_f and c axes values coincided each other at X=13, where the suffix f denotes the distorted pseudo-fluorite cell. In the tetragonal hafnia (10&lnE;X&lnE;16), the oxygen displacement from the ideal fluorite site decreased with increasing of YO_<1.5< content. The HfO_2-13 mol% YO_<1.5> sample exhibited an axial ratio of unity within the experimental resolution, but showed 112_f reflection peak, strongly suggesting the existence of the t″-form, which is defined as a tetragonal phase with a c/a_f of unity. The t″-form is interpreted to appear in the compositional region of 13 to 16 mol% YO_<1.5>.

    DOI： 10.2109/jcersj.103.622

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  • UNIT-CELL PARAMETERS AND OXYGEN DISPLACEMENT OF METASTABLE HFO2-YO1.5 SOLID-SOLUTIONS Reviewed

    M YASHIMA, T HIROSE, M KAKIHANA, Y SUZUKI, M YOSHIMURA

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   103 ( 6 )   622 - 628   1995.6

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    DOI： 10.2109/jcersj.103.622

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  • COMPLEX SUSCEPTIBILITIES OF CO-SUBSTITUTED YBA2CU3O7-D SYNTHESIZED BY THE POLYMERIZED COMPLEX METHOD

    H MAZAKI, H YASUOKA, M KAKIHANA, H FUJIMORI, M YASHIMA, M YOSHIMURA

    PHYSICA C   246 ( 1-2 )   37 - 45   1995.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/0921-4534(95)00121-2

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  • Distribution of the Tetragonal-Monoclinic Phase Transition Temperature in ZrO_2-YO_<1.5> Solid Solutions

    YASHIMA Masatomo, YOSHIMURA Masahiro

    Journal of the Ceramic Society of Japan   103 ( 1196 )   388 - 391   1995.4

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    Language：Japanese   Publisher：公益社団法人日本セラミックス協会  

    The destribution in the tetragonal-monoclinic (t-m) phase transition temperature was investigated by the thermal expansion measurements for the arc-melted ZrO_2-YO_&lt;1.5&gt; specimens. The peak temperature on heating A_P where the apparent thermal expansion coefficient has a minimum value, is higher than that on cooling M_P. The distribution of the transition temperatures increases with an increase of YO_&lt;1.5&gt; content. Therefore, the difference between the starting points of m→t transition on heating and of t→m transformation on cooling, A_S-M_S decreases with increasing YO_&lt;1.5&gt; content, and the M_S is higher than A_S in the 4mol%YO_&lt;1.5&gt; sample.

    DOI： 10.2109/jcersj.103.388

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  • DISTRIBUTION OF THE TETRAGONAL-MONOCLINIC PHASE-TRANSITION TEMPERATURE IN ZRO2-YO1.5 SOLID-SOLUTIONS Reviewed

    M YASHIMA, M YOSHIMURA

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   103 ( 4 )   388 - 391   1995.4

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    DOI： 10.2109/jcersj.103.388

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  • Phase Transitions and Phase Diagram of Zirconia Ceramics

    YASHIMA Masatomo, YOSHIMURA Masahiro

    まてりあ : 日本金属学会会報   34 ( 4 )   448 - 454   1995.4

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    Language：Japanese   Publisher：日本金属学会  

    DOI： 10.2320/materia.34.448

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  • Polymerized Complex Synthesis of the Modulation-free (Bi, Pb)2 Sr2(Ca, R)Cu2O8+d (R: Rare Earth=Y)

    Masato Kakihana, Minoru Osada, Masatomo Yashima, Masahiro Yoshimura, Toshiya Abiko, Sugitani Yoshinori, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   42 ( 6 )   735 - 740   1995

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：一般社団法人 粉体粉末冶金協会  

    DOI： 10.2497/jjspm.42.735

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  • In-situ Observation of the Diffusionless Tetragonal to Cubic Phase Transition and Metastable-Stable Phase Diagram in the ZrO2-ScO1.5 System Reviewed

    M. Yashima, N. Ishizawa, H. Fujimori, M. Kakihana, M. Yoshimura

    European Journal of Solid State and Inorganic Chemistry,   32   761 - 770   1995

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  • Polymerized Complex Synthesis of Pure BaTiO3 at Reduced Temperature Reviewed

    M. Arima, M. Kakihana, M. Yashima, M. Yoshimura

    European Journal of Solid State and Inorganic Chemistry,   32   863 - 871   1995

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  • Synthesis of stoichiometric hydroxyapatite by a "Gel" route from the aqueous solution of citric and phosphonoacetic acid Reviewed

    H. Takahashi, M. Yashima, M. Kakihana, M. Yoshimura

    European Journal of Solid State and Inorganic Chemistry   32   829 - 835   1995

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  • Polymerized complex route to the synthesis of multi-component oxides Reviewed

    M. Kakihana, M. Arima, M. Yashima, M. Yoshimura, Y. Nakamura, H. Mazaki, H. Yasuoka

    Ceramic Transactions (Sol-Gel Science and Technology)   55   65 - 76   1995

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  • Raman Scattering from Co-substituted YBa2Cu3-xCoxO6+y Superconductors

    Hirotaka Fujimori, Masato Kakihana, Masatomo Yashima, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   42 ( 7 )   792 - 797   1995

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：一般社団法人 粉体粉末冶金協会  

    DOI： 10.2497/jjspm.42.792

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  • OXYGEN-INDUCED STRUCTURAL-CHANGE OF THE TETRAGONAL PHASE AROUND THE TETRAGONAL-CUBIC PHASE-BOUNDARY IN ZRO2-YO1.5 SOLID-SOLUTIONS Reviewed

    M YASHIMA, S SASAKI, M KAKIHANA, Y YAMAGUCHI, H ARASHI, M YOSHIMURA

    ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS   50   663 - 672   1994.12

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  • Synthesis of Ca-doped Y124 Superconductor by Polymerized Complex Method Followed by O2-HIP Technique and Discussion of Ca-site Selectivity in the Crystal Structure.

    Masato Kakihana, Shigeru Nishio, Masatomo Yashima, Hiromasa Mazaki, Hiroshi Yasuoka, Masahiro Yoshimura, Pedro Berastegui

    Journal of the Japan Society of Powder and Powder Metallurgy   41 ( 4 )   361 - 364   1994.2

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：一般社団法人 粉体粉末冶金協会  

    DOI： 10.2497/jjspm.41.361

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  • Chemical design for functional multi-component oxides by polymerized complex method Reviewed

    M. Kakihana, M. Arima, M. Yashima, M. Yoshimura, H. Mazaki, H. Yasuoka

    Trans. Mat. Res. Soc. Jpn.   14A   801 - 806   1994

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  • Melt-quenching synthesis and Raman scattering study of ZrO2-RO1.5 (R=Rare Earth) solid solutions Reviewed

    K. Ohtake, M. Yashima, H. Arashi, M. Kakihana, M. Yoshimura

    Trans. Mat. Res. Soc. Jpn.   14A   717 - 720   1994

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  • Polymerized complex precursors for the synthesis of high pure PbTiO3 powders at 400-600℃ Reviewed

    O. Uchiyama, M. Kakihana, M. Arima, M. Yashima, Y. Suzuki, M. Yoshimura

    Trans. Mat. Res. Soc   14A   743 - 746   1994

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  • Polymerized Complex Synthesis of Superconductors and Their Properties

    Masato Kakihana, Masatomo Yashima, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 2 )   137 - 145   1993

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：一般社団法人 粉体粉末冶金協会  

    DOI： 10.2497/jjspm.40.137

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  • LANDAU THEORY TO SIMULATE THE STABLE AND METASTABLE PHASE-DIAGRAMS OF ZRO2-CONTAINING SYSTEMS Reviewed

    M YASHIMA, M YOSHIMURA

    COMPUTER AIDED INNOVATION OF NEW MATERIALS II, PTS 1 AND 2   763 - 766   1993

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Books

  • 理工系学生のための基礎化学 無機化学 2022年度版

    八島正知（ Role： Joint author第4章 固体化学Ⅰ 結晶構造 pp.26-32, 第5章 固体化学Ⅱ 化学結合、バンド構造と物性 pp.33-41）

    化学同人  2022.4 

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  • 粉末X線解析の実際

    八島正知（ Role： Joint author14.1 固形酸化物形燃料電池材料pp.253-258 14.4 触媒 pp.269-270）

    朝倉書店  2021.8  （ ISBN:9784254141092 ）

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    Total pages：x, 296p, 図版 [2] 枚   Language：Japanese  

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  • 複合アニオン化合物の科学

    八島正知（ Role： Joint author3章1節pp.87-101）

    丸善出版  2021.3  （ ISBN:9784621306109 ）

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    Total pages：xi, 247p   Language：Japanese  

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  • 固体酸化物形燃料電池の空気極材料の熱膨張と結晶構造－K2NiF４型酸化物の異方性熱膨張と等方性熱膨張の構造的要因－」，熱膨張制御材料の開発と応用

    八島正知（ Role： Joint author第18章 pp. 184-196）

    シーエムシー出版  2018.1 

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  • 理工系学生のための基礎化学 無機化学 第3版

    八島正知（ Role： Joint author4章, pp.25-32, 5章, pp33-41）

    化学同人  2018 

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  • Observation of the Ion Conduction Pathway by Neutron", Leading Edge of Materials and Systems Development for Next-generation Fuel Cells

    Masatomo YASHIMA（ Role： Joint authorpp. 155-163）

    CMC Publishing Co. Ltd.  2013.9 

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  • トコトンやさしいイオン交換の本 (今日からモノ知りシリーズ)

    八島正知（ Role： Joint author「コラム 固体の中のイオンの動き」，p. 134）

    日刊工業新聞社  2013.6 

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  • 情報機構講習会テキスト

    八島正知（ Role： Joint author「リートベルト法の基礎と結晶構造・材料解析のポイント」）

    情報機構  2009 

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  • 粉末X線解析の実際 第2版

    八島正知（ Role： Joint author「8章 構造解析のための回折データを測定する，8.4放射光利用測定」 pp. 142-147、「8章 構造解析のための回折データを測定する，8.5中性子粉末回折測定」pp. 147-148、「9章 RIETAN-FPを使ってみよう」pp. 149-167、「10章 MEMによる解析 10.4 MEMとMPF法による電子・核密度と不規則性の解析」pp. 175-180、「13章 実例で学ぶ粉末X線解析 H. 構造材料の構造解析」pp. 244-245、13.8 触媒の構造と電子・核密度の解析」pp. 246）

    朝倉書店  2009 

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  • 希土類の材料技術ハンドブック

    八島正知（ Role： Joint author「第4部材料合成における基礎理論と基礎技術； 31. 酸化物の構造解析； 31.3 中性子回折法」pp. 775-782）

    エヌ・ティー・エス  2008 

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  • Nanoparticle Technology Handbook

    Masatomo YASHIMA（ Role： Joint author"5.2.3 Neutron Diffraction" pp. 274-277, "5.2.4 Raman Scattering" pp. 277-279）

    Elsevier Pub. Co.  2007 

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  • 触媒年鑑 触媒技術の動向と展望 ２００４

    八島正知（ Role： Joint author「酸化物電解質における原子核密度分布の観測 – 最大エントロピー法と高温中性子回折法による酸化物イオンのディスオーダーと伝導経路の研究 -」, pp. 60-69）

    触媒学会  2004 

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  • Lecture Notes for Young Scientists in Neutron Science

    Masatomo YASHIMA（ Role： Joint author“Lecture Note: Study of Crystal Structure and Phase Transition by Neutron Diffraction”, pp. 113-130）

    Japanese Society for Neutron Science  2004 

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  • セラミック化学

    八島正知（ Role： Joint author「第４章 平衡状態図」, pp. 55-63）

    日本セラミックス協会  2003 

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  • セラミックス工学ハンドブック第２版 [応用]

    八島正知, 吉村昌弘（ Role： Joint author「第８編 エンジニアリングセラミックス, 2. 主なエンジニアリングセラミックスの性質, 2.1モノリシック材料, 2.1.1 酸化物系, (2)ジルコニア系」, pp. 1147-1150）

    技報堂出版  2002 

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  • Ceramists Talk for New Year and the Future

    T. Ando, K. Ikuina, M. G. M, U. Ismail, K. Umemura, H. Taira, Y. Takagi, M. Yashima, N. Mizutani, S. Hori（ Role： Joint author29, [1], pp.4-15）

    Bull. Ceram. Soc. Jpn  1994 

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  • 日本金属学会報：はばたく

    八島正知（ Role： Joint authorジルコニアセラミックスの立方−正方相転移, 32, [8], p.562）

    日本金属学会  1993 

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MISC

  • 水を吸ってセラミックス中の酸素がスイスイ動く？ Invited

    八島正知

    現代化学   657 ( 12 )   10 - 11   2025.11

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  • 六方ペロブスカイト関連酸化物における二量体を介した超高速酸化物イオン伝導 Invited Reviewed

    八島正知

    日本中性子科学会誌「波紋」   35 ( 3 )   123 - 128   2025.8

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  • ルビジウムを含む初めての 酸化物イオン伝導体Rb5BiMo4O16 を発見 Invited

    八島正知

    セラミックス   60 ( 7 )   503   2025.7

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    Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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  • 完全水和と大量の酸素空孔により 世界最高クラスのプロトン伝導度を示す 新六方ペロブスカイト関連酸化物を創製・発見

    八島正知

    セラミックス   59 ( 10 )   718   2024.10

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  • “逆転の発想”で世界最高のプロトン伝導度を示す新物質を発見

    齊藤 馨, 八島正知

    スポットライトリサーチ, 化学者のつぶやき   2024.2

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  • 結晶相と構造を知る （2）（XRD：結晶構造解析） ─Rietveld 法による結晶構造解析─

    八島正知

    セラミックス   59 ( 1 )   14 - 19   2024.1

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  • 高性能固体電解質 低温作動・低コストSOFCを目指して

    八島正知

    鉱山   76 ( 9 )   45 - 68   2023.11

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  • Elucidation of Nb/Mo ordering in Ba7Nb4MoO20

    藤井孝太郎, 安井雄太, 丹所正孝, 作田祐一, 後藤敦, 大木忍, 最上祐貴, 飯島隆広, 河口彰吾, 小林慎太郎, 大坂恵一, 池田一貴, 大友季哉, 八島正知

    日本セラミックス協会秋季シンポジウム講演予稿集(Web)   36th   2023

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  • Nb/Mo chemical order and proton position in an ionic conductor revealed by a combined technique of resonance X-ray diffraction, NMR, and neutron diffraction

    安井雄太, 丹所正孝, 藤井孝太郎, 作田祐一, 後藤敦, 大木忍, 最上祐貴, 飯島隆広, 河口彰吾, 小林慎太郎, 大坂恵一, 池田一貴, 池田一貴, 大友季哉, 大友季哉, 八島正知

    量子ビームサイエンスフェスタ(Web)   2022   2023

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  • Hidden Mo Occupational Order in the Disordered Ba7Nb4MoO20 Revealed by Resonance X-Ray Diffraction and Solid-State NMR

    安井雄太, 藤井孝太郎, 作田祐一, 八島正知, 丹所正孝, 後藤敦, 大木忍, 最上祐貴, 飯島隆広, 河口彰吾, 小林慎太郎, 大坂恵一, 池田一貴, 大友季哉

    日本セラミックス協会年会講演予稿集(Web)   2023   2023

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  • Crystal Structure and Oxide-ion Conduction Path of Dion-Jacobson-Type Oxide-ion Conductors

    神田橋治恵, ZHANG W., 村上泰斗, 藤井孝太郎, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

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  • Crestal Structure and Electrical Conductivity of Hexagonal Perovskite-Related Oxide Ba7Nb4MoO20 and its Related Materials

    作田祐一, 辻口峰史, 藤井孝太郎, 村上泰斗, 八島正知, 鳥居周輝, 神山崇, HESTER James R.

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

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  • Improvement of Oxide-ion Conductivity of the Hexagonal Perovskite-Related Oxide Ba7Nb4MoO20 by W Doping

    鈴木雄貴, 藤井孝太郎, 村上泰斗, 八島正知

    日本セラミックス協会関東支部研究発表会講演要旨集   36th   2020

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  • Crystal structure and electrical conduction of Ba7Nb4MoO20 materials with essential oxygen deficiency layer

    作田祐一, 藤井孝太郎, 村上泰斗, 八島正知, HESTER James R.

    日本セラミックス協会関東支部研究発表会講演要旨集   36th   2020

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  • Discovery of a Dion-Jacobson-Type Oxide-ion Conductor CsBi2Ti2NbO10-δ and Ion Conduction Mechanism

    八島正知, ZHANG W., 神田橋治恵, 村上泰斗, 藤井孝太郎

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

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  • Electrical conductivity and crystal structure of Ba3WVO8.5 based oxide-ion conductors

    菊地優冴, 藤井孝太郎, 村上泰斗, 八島正知

    日本セラミックス協会関東支部研究発表会講演要旨集   36th   2020

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  • Ba7Nb4MoO20系材料の電気伝導と結晶構造

    作田祐一, 辻口峰史, 安井雄太, 藤井孝太郎, 村上泰斗, 鳥居周輝, 神山崇, HESTER James R., 八島正知

    日本結晶学会年会講演要旨集   2020 (CD-ROM)   2020

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  • 六方ペロブスカイト関連構造をもつBa3WNbO8.5-δの結晶構造解析と酸化物イオン伝導経路の可視化

    安井雄太, 藤井孝太郎, 村上泰斗, 辻口峰史, HESTER James R., 八島正知

    日本結晶学会年会講演要旨集   2020 (CD-ROM)   2020

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  • Oxide-ion conductivity and crystal structure of Ba3WVO8.5 related materials

    菊地優冴, 八島正知, 藤井孝太郎, 村上泰斗

    固体イオニクス討論会講演要旨集   46th (CD-ROM)   2020

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  • Discovery of New Oxide-Ion Conductor Ba3W1+xV1-xO8.5+x/2

    菊地優冴, 藤井孝太郎, 村上泰斗, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

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  • Mechanochemical Synthesis and Crystal Structure Analysis of Argyrodite-type Li6SbS5I Electrolytes

    木村拓哉, 保手浜千絵, 藤井孝太郎, 八島正知, 作田敦, 辰巳砂昌弘, 林晃敏

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   33rd   2020

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  • Synthesis and Improvement of Electrical Conductivity of La1-xSrxO0.5-x/2F2

    田中真祐, 藤井孝太郎, 村上泰斗, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

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  • Improvement of Oxide-ion Conductivity of the Hexagonal Perovskite-Related Oxide Ba7Nb4MoO20 by W Doping

    鈴木雄貴, 藤井孝太郎, 村上泰斗, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

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  • Photoluminescence properties of Eu-doped new layered oxychlorides Ba3Y2O5Cl2

    岩佐祐希, 荻野拓, 高田芙美, 西尾太一郎, 龍田誠, 岸尾光二, 辻本吉廣, 柳田健之, 藤井孝太郎, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

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  • Monoclinic-Orthorhombic Phase Transition in BaNdInO4

    志賀仁美, 藤井孝太郎, 村上泰斗, 八島正知, 萩原雅人, 神山崇

    日本セラミックス協会年会講演予稿集(CD-ROM)   2020   2020

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  • Crystal structure analysis of the oxide ion conductor BaNdInO4 by high-temperature neutron diffraction

    SHIGA Hitomi, SHIRAIWA Masahiro, ZHANG Wenrui, YASUI Yuta, TEJIMA Hiroaki, FUJII Kotaro, MURAKAMI Taito, HAGIHALA Masato, TORII Shuki, MIAO Ping, KAMIYAMA Takashi, YASHIMA Masatomo

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   2019   2019

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  • 新構造型酸化物イオン伝導体BaLaZn3GaO7の結晶構造と電気伝導

    手島広明, 藤井孝太郎, 丹羽栄貴, 村上泰斗, 八島正知

    固体イオニクス討論会講演要旨集   45th   2019

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  • Relationship between the crystal structure and electrical properties of novel oxide ion conductor with hexagonal perovskite-type structure

    MURAKAMI Taito, TSUJIGUCHI Takafumi, SAKUDA Yuichi, YASUI Yuta, MIAO Ping, HAGIHARA Masato, TORII Shuki, KAMIYAMA Takashi, FUJII Kotaro, YASHIMA Masatomo

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   2019   2019

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  • Ba3MoNbO8.5における酸化物イオン拡散のメカニズム

    作田祐一, 辻口峰史, 藤井孝太郎, 丹羽栄貴, 村上泰斗, 西岡駿太, 西岡駿太, HESTER James R., 前田和彦, 八島正知

    日本結晶学会年会講演要旨集   2019   2019

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  • Oxide-ion diffusion pathway and conductivity of the hexagonal perovskite-related oxide Ba3MoNbO8.5-δ and its related materials

    SAKUDA Yuichi, TUJIGUCHI Takafumi, FUJII Kotaro, NIWA Eiki, MURAKAMI Taito, NISHIOKA Shunta, NISHIOKA Shunta, HESTER James R., MAEDA Kazuhiko, YASHIMA Masatomo

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   2019   2019

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  • Structure, electron density and diffusion path of mixed-anion compounds and oxides

    YASHIMA Masatomo, HIBINO Keisuke, TSUJIGUCHI Takafumi, FUJII Kotaro, MURAKAMI Taito, MAEDA Kazuhiko

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   2019   2019

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  • Discovery of a new oxide-ion conductor BaLaZn3GaO7

    TEJIMA Hiroaki, FUJII Kotaro, NIWA Eiki, MURAKAMI Taito, YASHIMA Masatomo

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   2019   2019

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  • 高温中性子粉末回折によるBaNdInO4の結晶構造解析

    志賀仁美, 藤井孝太郎, 村上泰斗, 白岩大裕, 八島正知, 萩原雅人, 神山崇

    日本結晶学会年会講演要旨集   2019   2019

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  • 新型のイオン伝導体である新物質SrYbInO4を発見

    Masatomo YASHIMA

    セラミックデータブック 2018/19 工業と製品   46 ( 100 )   80 - 82   2018.12

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  • Aサイト秩序型二重ペロブスカイトCaZnTi2O6の高圧合成,構造および誘電性

    森紘夢, 植田紘一郎, 稲熊宜之, 藤井孝太郎, 八島正知

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   31st   2018

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  • Sillen-Aurivillius型層状ペロブスカイト化合物の単結晶育成

    ZHONG Chengchao, 加藤大地, 阿部竜, 陰山洋, 藤井孝太郎, 八島正知, 藤井康裕, 是枝聡肇

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   31st   2018

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  • (依頼記事) 「アパタイト型イオン伝導体には格子間酸素がいるか？ -ランタンケイ酸塩の単結晶中性子回折」 Invited Reviewed

    Masatomo YASHIMA

    化学   73 ( 8 )   70 - 71   2018

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  • (依頼記事)「複合アニオン化合物の結晶構造と化学結合」 Invited Reviewed

    Masatomo YASHIMA

    セラミックス   52 ( 12 )   754   2017

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  • “Developments of in situ Measurements of Neutron and Synchrotron X-ray Diffraction Data of Ceramic Materials at High Temperatures and Precise Crystal Structure Analysis”

    M. Yashima, K. Fujii, E. Niwa, K. Omoto, K. Ueda, S. Yamada, M. Shiraiwa, K. Saito, A. Fujimoto

    Report of the 172nd Committee for Alloy Phase Diagram   17 ( 2 )   54 - 59   2017

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  • “Thermodynamic and Kinetic Analyses of C02 Absorption Material, Li4Si04

    E. Niwa, S. Kaniwa, K. Fujii, T. Hashimoto, M. Yashima

    Report of the 172nd Committee for Alloy Phase Diagram   17 ( 2 )   91 - 92   2017

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  • “Exploration of New-Type Iron Conductors by the Bond Valence Method”

    M. Yashima, K. Fujii, E. Niwa

    Report of the 172nd Committee for Alloy Phase Diagram   17 ( 1 )   85 - 88   2017

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  • 「中性子とX線回折による複合アニオン化合物の構造解析」

    Masatomo YASHIMA

    News Letter (複合アニオン化合物の創製と新機能)   2   27 - 29   2017

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  • Ba2-xLaxFe2O5+δの構造相転移および電気伝導機構

    丹羽栄貴, 丹羽栄貴, 佐藤翼, 大木葉隆史, 小豆川勝見, 松尾基之, 藤代史, 藤井孝太郎, 橋本拓也, 八島正知

    電気化学会大会講演要旨集(CD-ROM)   83rd   ROMBUNNO.2P11   2016.3

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  • プロトン伝導体BaCe1-xRxO3-δ(R:希土類)の格子体積と光学的特性

    丹羽栄貴, 藤井孝太郎, 八島正知, 保坂友美, 尾上貴弘, 畠山義清, 十代健, 橋本拓也, 藤代史

    日本セラミックス協会年会講演予稿集(CD-ROM)   2016   ROMBUNNO.2J27   2016.3

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  • ジルコンZrSiO4の電気的特性と結晶構造

    森瀬貴彦, 丹羽栄貴, 藤井孝太郎, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2016   ROMBUNNO.1P229   2016.3

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  • 1480°Cにおけるα‐SrGa2O4の結晶構造の決定

    齋藤圭汰, 藤井孝太郎, 丹羽栄貴, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2016   ROMBUNNO.1P227   2016.3

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  • Ruddlesden‐Popper相Sr3Ti2O7とLa2SrAl2O7における熱膨張の異方性

    永峰翔太, 藤井孝太郎, 丹羽栄貴, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2016   ROMBUNNO.1P230   2016.3

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  • 新物質ASr2Ga11O20(A=Pr,Nd)およびABa2Ga11O20(A=La,Pr,Nd,Sm)の結晶構造と電気的特性

    山田駿太郎, 藤井孝太郎, 丹羽栄貴, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2016   ROMBUNNO.2J28   2016.3

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  • 結晶構造に基づいた物質構造特許新構造ファミリーのイオン伝導体の発見

    八島正知, 藤井孝太郎, 尾本和樹, 上田孝志朗, 山田駿太郎, 齋藤圭汰, 藤本絢香, 江崎勇一, 齋藤千紘, 中島靖

    日本セラミックス協会年会講演予稿集(CD-ROM)   2016   ROMBUNNO.2J29   2016.3

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  • 新規酸化物イオン伝導体SrNdInO4の発見

    藤本絢香, 藤井孝太郎, 丹羽栄貴, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2016   ROMBUNNO.1P225   2016.3

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  • Ca2R3Ta3O14(R=Y,Ho,Dy)の電気的特性および結晶構造

    海野航, 藤井孝太郎, 丹羽栄貴, 山本直紀, 三宮工, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2016   ROMBUNNO.1P231   2016.3

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  • ZnO5ピラミッドを含む新型酸化物イオン伝導体BaZnHo2O5の発見

    中村圭吾, 藤井孝太郎, 丹羽栄貴, 八島正知

    日本セラミックス協会年会講演予稿集(CD-ROM)   2016   ROMBUNNO.1P228   2016.3

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  • “A New Structure Family of Oxide-Ion Conductor NdBaInO4”

    M. Yashima, K. Fujii

    ISSP Activity Report 2014   47 - 48   2016

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  • 「新しい層状構造を有する酸化物イオン伝導体の発見」

    八島正知, 藤井孝太郎

    CROSS   43   2016

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  • 2. (Invited Review, Single author, Corresponding author) “Precise Structure Analysis of Inorganic Materials for Clean Energy by Maximum-Entropy Method: Neutron and Synchrotron X-Ray Powder Diffraction Studies

    Masatomo YASHIMA

    Structual Characterization Techniques:Advances and Applications in Clean Energy   Capter 8   223 - 244   2016

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  • (依頼記事) 「新しい層状構造を有する酸化物イオン伝導体の発見」 Invited

    八島正知, 藤井孝太郎

    パリティ   30 ( 1 )   19 - 21   2015

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  • 4. (Invited Review, Single author, Corresponding author)“Crystal Structure, Electron-Density Distribution and Ion-Diffusion Pathway of Ceramic Materials Investigated by Multiple Approaches Including Neutron and X-ray Diffraction Methods” Reviewed

    Masatomo YASHIMA

    結晶学会誌   57 ( 1 )   13 - 19   2015

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  • (First author, Single author, Corresponding author, Invited Review) “Invited Review: Some recent developments in the atomic-scale characterization of structural and transport properties of ceria-based catalysts and ionic conductors Reviewed

    Masatomo YASHIMA

    Catal. Today   253   3 - 19   2015

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  • (Invited Review, Single author, Corresponding author) “Chapter 3. Crystal Structure, Structural Disorder and Oxide-Ion Diffusional Pathway of Fluorite-Type Oxides and Fluorite- Related Phases” Reviewed

    Masatomo YASHIMA

    New Research Trends of Fluorite-Based Oxide Materials: From Basic Chemistry and Materials Science to Engineering Applications   59 - 78   2014

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  • “Discovery of a New Structure Family exhibiting Oxide-Ion Conduction NdBaInO4”

    M. Yashima, K. Fujii, Y. Esaki, M. Shiraiwa, K. Omoto

    Report of the 172nd Committee for Alloy Phase Diagram   14 ( 2 )   46 - 47   2014

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  • (依頼記事)「酸化物イオン伝導体の新構造ファミリーNdBaInO4を発見」 Invited

    藤井孝太郎, 八島正知

    パリティ   29 ( 9 )   35 - 37   2014

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  • “Oxide-Ion Diffusion Pathway of Ceria-Zirconia Nano-sized Sample and Proton Diffusion Pathway of Hydroxyapatite Investigated by Bond Valence Method and High-Temperature Neutron Diffraction”

    Masatomo YASHIMA

    Report of the 172nd Committee for Alloy Phase Diagram   14 ( 1 )   69 - 74   2014

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  • 「新構造ファミリーの酸化物イオン伝導性材料を発見」

    藤井孝太郎, 八島正知

    セラミックス   49 ( 7 )   615   2014

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  • (Invited Review)"High Temperature Powder Diffractometry and Structure-Property Correlation of Materials at High Temperatures" Invited

    Masatomo YASHIMA

    第3章   140 - 141   2014

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  • "Monoclinic-Hexagonal Phase Transition Mechanism and Proton Conduction of Hydroxyapatite"

    Masatomo YASHIMA

    M. Yashima, Y. Yonehara, N. Kubo and H. Fujimori   13 ( 1 )   30 - 42   2013

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  • (Invited Review, Single author, Corresponding author) “Crystal and Electronic Structures, Structural Disorder, Phase Transformation, and Phase Diagram of Ceria-Zirconia and Ceria-Based Materials

    Masatomo YASHIMA

    Catalysis by Ceria and Related Materials 2nd Edition   Chapter 1   1 - 45   2013

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  • “Invited Review: Crystal Structure and Catalytic Activity of Ceria-Zirconia Solid Solutions” Invited

    Masatomo YASHIMA

    Material Integration   26 ( 1 )   7 - 11   2013

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  • Lithium Diffusion in LixFePO4

    YAMADA ATSUO, NISHIMURA SHIN-ICHI, KOBAYASHI GENKI, YASHIMA MASATOMO, OHOYAMA KENJI, YAMAGUCHI YASUO

    日本原子力研究開発機構JAEA-Review(Web)   ( 2011-050 )   WEB ONLY 1-1-42   2012.3

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  • (依頼解説) 「強誘電セラミックスの結晶構造解析」 Invited

    Masatomo YASHIMA

    熱測定   39 ( 3 )   112 - 115   2012

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  • (依頼解説)「中性子回折による無機材料の結晶構造とイオン拡散経路の研究」 Invited

    Masatomo YASHIMA

    表面科学   33 ( 5 )   284 - 289   2012

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  • (依頼解説) 「中性子回折法を用いたイオン伝導性材料におけるイオン拡散機構の研究」 Invited

    Masatomo YASHIMA

    中性子科学会誌 波紋   21 ( 2 )   96 - 99   2011

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  • 「中性子回折法によるイオン伝導性セラミック材料の結晶構造解析」

    Masatomo YASHIMA

    中性子回折の基礎と応用   59 - 68   2011

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  • 「中性子粉末回折法による触媒の結晶構造解析」

    Masatomo YASHIMA

    中性子回折の基礎と応用   79 - 87   2011

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  • 「リートベルト法の基礎と結晶構造・材料解析のポイント」

    Masatomo YASHIMA

    情報機構講習会テキスト   2011

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  • （日本結晶学会ポスター賞論文）「Imma ペロブスカイト型酸窒化物LaTiO2Nの結晶構造と電子密度: 可視光応答性の構造的要因」

    八島正知, 齊藤未央

    日本結晶学会誌   53 ( 2 )   107 - 112   2011

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    Language：Japanese   Publisher：The Crystallographic Society of Japan  

    Highly crystalline lanthanum titanium oxynitride LaTiO2N has been determined to have an Imma perovskite-type structure with a0b—b— tilt system by the electron, neutron and synchrotron diffraction experiments (Yashima et al., Chem. Comm., 46, 4704-4706 (2010)). The refined crystallographic parameters agree well with those of the optimized structure obtained by density functional theory-based calculations. Experimental and theoretical electron densities indicate the covalent bonding between Ti cation and N,O anions. The covalent bonding and existence of N atoms are responsible for the reduced band gap, which leads to the visible-light response of LaTiO2N photocatalyst.

    DOI： 10.5940/jcrsj.53.107

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  • 「化学掲示板： 2月2日毎日新聞, プラセオジムニッケル系酸化物の構造を解明」

    Masatomo YASHIMA

    化学   65 ( 4 )   74 - 75   2010

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  • 「ニッケル酸プラセオジム系混合伝導体における酸素透過メカニズム」

    Masatomo YASHIMA

    未来材料   10 ( 8 )   35 - 40   2010

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  • （依頼記事，講座： “中性子回折の基礎と応用”）「中性子回折によるイオン伝導性セラミック材料の結晶構造解析」 Invited

    Masatomo YASHIMA

    RADIOISOTOPES誌   59 ( 3 )   201 - 210   2010

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  • 「（依頼記事）イオン伝導性セラミック材料におけるイオン拡散経路の可視化」 Invited

    Masatomo YASHIMA

    燃料電池   9 ( 4 )   83 - 89   2010

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  • 依頼講演：「イオン伝導性材料の結晶構造解析とイオン伝導経路の可視化」 Invited

    Masatomo YASHIMA

    茨城県中性子利用促進研究会磁性・電池材料の構造解析分科会：イオン伝導や水素結合に関する材料の構造解析 資料   2010

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  • 「（依頼記事，講座： “中性子回折の基礎と応用”）「触媒の結晶構造解析」 Invited

    Masatomo YASHIMA

    RADIOISOTOPES誌   59 ( 3 )   221 - 229   2010

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  • 依頼講義テキスト「リートベルト法の基礎と結晶構造・材料解析のポイント」 Invited

    Masatomo YASHIMA

    情報機構講習会テキスト   2009

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  • 高温放射光X線回折によるLi2TiO3の結晶構造および相転移の解析

    尾本和樹, 橋本拓也, 佐々木一哉, 寺井隆幸, 星野毅, 八島正知

    電気化学会大会講演要旨集   76th   2009

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  • 高温放射光X線回折によるLi2TiO3の結晶構造および相転移の解析

    尾本和樹, 橋本拓也, 佐々木一哉, 寺井隆幸, 星野毅, 八島正知

    PFシンポジウム要旨集   26th   2009

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  • Li2TiO3の結晶構造・相転移・熱膨張挙動-高分解能高温放射光X線回折による解析

    橋本拓也, 尾本和樹, 佐々木一哉, 寺井隆幸, 星野毅, 八島正知

    日本原子力学会春の年会予稿集(CD-ROM)   2009   2009

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  • クリスタリット「イオン伝導」

    Masatomo YASHIMA

    結晶学会誌   51 ( 2 )   182   2009

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  • 「第一原子計算による-Cu2V2O7の結晶構造と電子構造の評価」

    八島正知, 鈴木亮輔

    合金状態図第172委員会研究報告書   9 ( 1 )   11 - 19   2009

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  • 「(依頼解説記事) 酸化物の結晶構造解析により可視化した酸素イオンの拡散経路」 Invited

    Masatomo YASHIMA

    ペトロテック   32 ( 5 )   335 - 340   2009

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  • (Invited Review, セラミックス協会賞受賞記念論文, First author, Single author, Corresponding author) The 63th CerSJ Awards for Academic Achievement in Ceramic Science and Technology: Review, “Diffusion Pathway of Mobile Ions and Crystal Structure of Ionic and Mixed Cond Invited Reviewed

    Masatomo YASHIMA

    J. Ceram. Soc. Jpn.   117 ( 10 )   1055 - 1059   2009

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  • 「Ⅳ イオン伝導性材料の結晶構造とイオン伝導経路の解析技術」

    Masatomo YASHIMA

    セミナーテキスト：リチウムイオン電池用正極・負極における熱処理およびアニール処理による結晶構造と電池特性の制御，応用   2009

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  • 結晶学会賞受賞記念論文（総合報告）「高温精密構造解析によるイオン伝導性材料における可動イオン拡散経路の研究」 Reviewed

    Masatomo YASHIMA

    結晶学会誌   51 ( 2 )   153 - 161   2009

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  • 依頼解説記事「排ガス浄化触媒セリア―ジルコニア固溶体の相転移と不規則構造, - 高い触媒活性の構造的要因を探る -」 Invited

    脇田崇弘, 八島正知

    ファインケミカルズ   37 ( 12 )   23 - 32   2008

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  • 依頼解説記事「イオン伝導体，混合伝導体と光触媒の構造物性 -ペロブスカイト型とその類縁酸化物における可動イオンの拡散経路，およびSm2Ti2S2O4.9における化学結合の可視化 -」 Invited

    Masatomo YASHIMA

    セラミックス   43 ( 11 )   922 - 928   2008

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  • 「高温中性子回折法による結晶構造，相転移と状態図の研究の現状と課題： J-Parcへの期待」

    Masatomo YASHIMA

    合金状態図第172委員会研究報告書   8 ( 1 )   6 - 9   2008

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  • (依頼講義のテキスト) 八島正知，「役に立つセラミックスの基礎２： 状態図・熱力学」 Invited

    Masatomo YASHIMA

    平成20年度セラミックス大学 テキストＡ   87 - 101   2008

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  • 「依頼解説：YとScを含むセラミックスの結晶構造と状態図」 Invited

    Masatomo YASHIMA

    マテリアルインテグレーション   21 ( 1 )   3 - 7   2008

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  • 「第4部材料合成における基礎理論と基礎技術； 31. 酸化物の構造解析； 31.3 中性子回折法」

    Masatomo YASHIMA

    希土類の材料技術ハンドブック   775 - 782   2008

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  • Structure Refinement by High Temperature in situ Powder X-ray Diffraction Study of High Temperature Orthopyroxene

    OHI Shugo, MIYAKE Akira, SHIMOBAYASHI Norimasa, KITAMURA Masao, YASHIMA Masatomo

    2007   136 - 136   2007.9

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  • In situ observation of the tetragonal-cubic phase transition in the CeZrO4 solid solution - A high-temperature neutron diffraction study

    Takahiro Wakita, Masatomo Yashima

    Acta Crystallographica Section B: Structural Science   63 ( 3 )   384 - 389   2007.5

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    DOI： 10.1107/S0108768107007720

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  • 19pPSA-22 Diffusion Path of Oxide Ions in La-silicate Apatite

    Matsushita Yoshitaka, Ali Roushown, Izumi Fujio, Kitazawa Hideaki, Yashima Masatomo

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   721 - 721   2007.2

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  • 「イオン伝導体における不規則構造と可動イオンの拡散経路」

    Masatomo YASHIMA

    合金状態図第172委員会研究報告書   7 ( 1 )   12 - 18   2007

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  • 「放射光を利用した精密構造解析」

    Masatomo YASHIMA

    粉末Ｘ線解析の実際＜日本結晶学会講習会テキスト＞   155 - 195   2007

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  • Ionic path in oxygen-ionic conductor La-9.70(Si5.8Mg0.2)O-26.35

    Yoshitaka Matsushita, Ali Roushown, Fujio Izumi, Hideaki Kitazawa, Masatomo Yashima

    ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES   63   S218 - S218   2007

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    DOI： 10.1107/S0108767307095013

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  • 「Ｘ線・中性子・放射光粉末回折による構造解析」

    Masatomo YASHIMA

    情報機構セミナーテキスト(AC070417)   2007

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  • 「リートベルト法入門」

    Masatomo YASHIMA

    粉末Ｘ線解析の実際＜日本結晶学会講習会テキスト＞   75 - 89   2007

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  • 「リートベルト解析の実際」

    Masatomo YASHIMA

    粉末Ｘ線解析の実際＜日本結晶学会講習会テキスト＞   99 - 111   2007

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  • (依頼講義のテキスト) 「役に立つセラミックスの基礎２： 状態図・熱力学」

    Masatomo YASHIMA

    平成19年度セラミックス大学 テキストＡ   77 - 97   2007

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  • 27pYA-6 Phase Transition and Surface Structure of Barium Titanate Nanoparticles

    Hoshina Takuya, Kakemoto Hirofumi, Tsurumi Takaaki, Wada Satoshi, Yashima Masatomo, Kuroiwa Yoshihiro

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   929 - 929   2006.3

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  • (依頼講義のテキスト) 「役に立つセラミックスの基礎２： 状態図・熱力学」

    Masatomo YASHIMA

    平成18年度セラミックス大学 テキストＡ   57 - 66   2006

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  • (依頼解説記事)「中性子回折によるセラミックスの構造解析」 Invited

    Masatomo YASHIMA

    セラミックス   41 ( 12 )   1014 - 1019   2006

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  • 「高温構造物性解析」

    Masatomo YASHIMA

    S&E公開セミナーテキスト   2006

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  • (依頼解説記事)「イオン伝導体における不規則構造と可動イオンの拡散経路」 Invited

    Masatomo YASHIMA

    日本結晶学会誌   48 ( 1 )   25 - 29   2006

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  • Particle Size and Temperature Dependence of THz-Region Dielectric Properties for BaTiO3 Nanoparticle

    T.Hoshina, Y.Kuroiwa, M.Yashima, H.Kakemoto, T.Tsurumi S.Wada

    MS&T Proceedings, accept for publication   0 ( 0 )   0   2006

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  • 「高温高分解能放射光粉末回折法の開発」

    八島正知, 田中雅彦, 大内健二郎, 井田隆

    合金状態図第172委員会研究報告書   6 ( 1 )   1 - 8   2006

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  • 「5.2.3 中性子回折」

    Masatomo YASHIMA

    「ナノパーティクルテクノロジーハンドブック： 基礎編第5章 材料ナノ構造の測定法 5.2 結晶構造」   257 - 259   2006

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  • 「5.2.4 ラマン散乱」

    Masatomo YASHIMA

    「ナノパーティクルテクノロジーハンドブック： 基礎編第5章 材料ナノ構造の測定法 5.2 結晶構造」   259 - 262   2006

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  • 「Ｘ線・中性子・放射光粉末回折による構造解析 ～リートベルト解析から最大エントロピー法を用いた電子・核密度の解析まで～」

    Masatomo YASHIMA

    情報機構セミナーテキスト(AB060576)   2006

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  • 20aYM-7 Phase Transition Behavior of Barium Titanate Nanoparticles

    Hoshina Takuya, Kakemoto Hirofumi, Tsurumi Takaaki, Wada Satoshi, Yashima Masatomo, Kuroiwa Yoshihiro

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   808 - 808   2005.8

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  • 27aYQ-2 Atomic and Magnetic Structures in a Ternary Alloy CuMnPt_6

    Takahashi Miwako, Das A. K., Nakamura Reo, Ohshima Ken-ichi, Shishido Toetsu, Yashima Masatomo

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   760 - 760   2005.3

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  • “Development of High-Temperature Powder Diffractometry and Precise Structural Analysis”

    Masatomo YASHIMA

    PF NEWS   23 ( 2 )   20 - 26   2005

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  • “(Invited Refereed Review in Highlight) Visualization of the Diffusion Path and Disorder in Oxide-Ion Conductors," Invited

    Masatomo YASHIMA

    Activity Report on Neutron Scattering Research, Research Highlights 2005   12   34 - 37   2005

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  • Size and Temperature Induced Phase Transition Behaviors of Barium Titanate Nanoparticles

    Takuya Hoshina, Hirofumi Kakemoto, Takaaki Tsurumi, Satoshi Wada, Masatomo Yashima

    Transactions of the Materials Research Society of Japan   30 ( 1 )   67 - 70   2005

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  • 「役に立つセラミックスの基礎２： 状態図・熱力学」 (依頼講義のテキスト) Invited

    Masatomo YASHIMA

    平成17年度セラミックス大学 テキストＡ   55 - 64   2005

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  • (依頼記事) 「高温中性子回折法による固体電解質材料のイオン伝導経路の研究」 Invited

    八島正知, 野村勝裕

    電気化学会誌 Electrochemistry   73 ( 1 )   71 - 76   2005

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  • “(Invited Refereed Review in Highlight) Design, Fabrication and Performance of a New Furnace for High-Resolution Synchrotron Radiation Powder Diffraction Studies up to 1900 K – An Application to Determine the Electron-density Distribution of Cubic CaTiO3 Invited

    M. Yashima, M. Tanaka

    Photon Factory Activity Report 2004, Part A Highlights and Facility Reports   22   32 - 33   2005

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  • 「相変態温度の精度は回折計の角度分解能にどれだけ依存するか？」

    Masatomo YASHIMA

    合金状態図第172委員会研究報告書   5 ( 1 )   1 - 5   2005

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  • Crystal Structure and Oxide-ion Conduction of (La0.9Sr0.1)AlO3-.DELTA. Perovskite

    野村勝裕, 竹市信彦, 蔭山博之, 八島正知

    固体イオニクス討論会講演要旨集   30th   238 - 239   2004.12

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  • 「固体酸化物燃料電池材料の結晶相の評価： 基礎と応用」 Invited

    Masatomo YASHIMA

    燃料電池   4 ( 2 )   89 - 94   2004

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  • Size and Temperature Induced Phase Transition Behaviors of Barium Titanate Nanoparticles

    T. Hoshina, H, Kakemoto, T, Tsurumi S, Wada, M. Yashima

    Transaction of the Materials Research Society of Japan   29 ( 4 )   1207 - 1210   2004

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  • シンクロトロン放射光を用いたチタン酸バリウムナノ粒子における複合構造の解明

    保科拓也, 掛本博文, 鶴見敬章, 和田智志, 八島正知, 加藤健一, 高田昌樹

    第24回電子材料研究討論会   68   2004

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  • (依頼解説)「イオン伝導体における酸化物イオンの分布と伝導経路」 Invited

    Masatomo YASHIMA

    エコインダストリー   9 ( 4 )   23 - 28   2004

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  • シンクロトロン放射光を用いた高誘電率チタン酸バリウム微粒子の構造解析

    保科拓也, 掛本博文, 和田智志, 鶴見敬章, 石村大樹, 小林周平, 中村渉, 八島正知, 加藤健一, 高田昌樹

    日本セラミックス協会2004年年会   2004

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  • チタン酸バリウムナノ粒子におけるサイズおよび温度誘起相転移挙動の解明

    保科拓也, 掛本博文, 鶴見敬章, 和田智志, 八島正知

    第15回日本MRS学術シンポジウム   2004

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  • (依頼記事) 「J-PARC中性子粉末回折装置が拓く材料科学工学のフロンティア」 Invited

    Masatomo YASHIMA

    日本中性子科学会誌「波紋」   14 ( 1 )   17 - 21   2004

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  • (依頼記事)「イオン伝導体における酸化物イオンのディスオーダーと拡散経路」 Invited

    Masatomo YASHIMA

    日本結晶学会誌   46 ( 3 )   232 - 237   2004

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  • (依頼講義のテキスト) 「役に立つセラミックスの基礎２： 状態図・熱力学」

    Masatomo YASHIMA

    平成16年度セラミックス大学 テキストＡ   25 - 33   2004

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  • "High-Resolution Synchrotron Radiation Powder Diffraction Study of Phase Change in Ceramic Materials," Invited

    Masatomo YASHIMA

    Photon Factory Activity Report 2001, Part A Highlights and Facility Reports   ( 19 )   21 - 23   2003

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  • (依頼講義のテキスト) 「役に立つセラミックスの基礎2: 状態図・熱力学」 Invited

    Masatomo YASHIMA

    平成15年度セラミックス大学テキストA   17 - 25   2003

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  • (Invited review with a referee, Highlight) "How Does the Accuracy of a Continuous Phase Transition Temperature Depend on the Angular Resolution of Powder Diffractometer?," Invited

    M. Yashima, M. Mori, M. Tanaka

    Photon Factory Activity Report 2002, Part A Highlights and Facility Reports   ( 20 )   23 - 24   2003

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  • (依頼解説) 「セリア-ジルコニア系状態図と固溶体」 Invited

    Masatomo YASHIMA

    マテリアルインテグレーション   16 ( 4 )   15 - 19   2003

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  • (依頼講義のテキスト) 「役に立つセラミックスの基礎2: 状態図・熱力学」 Invited

    Masatomo YASHIMA

    平成14年度セラミックス大学テキストA   17 - 21   2002

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  • (依頼解説) 「最近の研究：高温中性子粉末回折装置の開発とセラミックス材料の結晶構造の研究」 Invited

    Masatomo YASHIMA

    日本結晶学会誌   44 ( 2 )   121 - 126   2002

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  • (依頼解説) 「セラミックス系へのCALPHAD法の応用」 Invited

    Masatomo YASHIMA

    セラミックス   37 ( 7 )   509 - 511   2002

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  • (依頼解説)「放射光Ｘ線粉末回折による無機化合物の相変化の研究」 Invited

    八島正知, アリローション, 田中雅彦, 森丈晴, 佐々木聡

    岩石鉱物科学   30 ( 2 )   74 - 75   2001

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  • Phase Transition and Soft Phonon Modes in SrZrO3 around 1200℃ by Ultraviolet Laser Raman Spectroscopy

    FUJIMORI H, YASHIMA M, KAKIHANA M, YOSHIMURA M

    Physical Review B   61 ( 6 )   3971 - 3974   2000

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  • 「希土類添加ジルコニアの粉砕による正方晶→単斜晶応力誘起相転移」

    Masatomo YASHIMA

    ジルコニアセラミックス13,14   13 - 32   1998

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  • 29p-PSB-11 Phonon Raman Scattering in Bi_2Sr_2Ca_<n-1>Cu_<2n+4+d>(n=1, 2, 3)

    Osada Minoru, Kakihana Masato, Kall Mikael, Borjesson Lars, Mazaki Hiromasa, Yasuoka Hiroshi, Yashima Masatomo

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   628 - 628   1997.3

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  • 28p-A-7 Local structure in defect-fluorite-type oxides Y_3TaO_7 IV

    Makino H, Mori S, Yamamoto N, Yano T, Ishizawa N, Yokota O, Yashima M, Kakihana M, Yoshimura M

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   375 - 375   1997.3

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  • Local structure in defect-fluorite-tipe oxides Y_3TaO_7III

    Makino H., Mori S., Yamamoto N., Yano T., Ishizawa N., Yokota O., Yashima M., Kakihana M., Yoshimura M.

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1996 ( 2 )   651 - 651   1996.9

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  • Metastable-stable phase diagrams in the zirconia-containing systems utilized in solid-oxide fuel cell application Reviewed

    M Yashima, M Kakihana, M Yoshimura

    SOLID STATE IONICS   86-8   1131 - 1149   1996.7

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  • Synthesis of R_2Ti_2O_7(R=Y, La, Nd) by Polymerized Complex Method

    KAKIHANA Masato, MILANOVA Maria M, OKUBO Toru, YASHIMA Masatomo, YOSHIMURA Masahiro

    ( 28 )   76 - 77   1996.5

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  • 31p-C-10 Local structure in defect-flourite-type oxides Y_3TaO_7 II

    Makino H, Mori S, Yamamoto N, Yano T, Ishizawa N, Yokota O, Yashima M, Kakihana M, Yoshimura M

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   51 ( 2 )   564 - 564   1996.3

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  • (依頼講義のテキスト)「セラミックスの状態図の見方・考え方」 Invited

    Masatomo YASHIMA

    平成8年度セラミックス大学テキストA,   28 - 27   1996

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  • (依頼解説記事) 「ジルコニアの相変態」 Invited

    Masatomo YASHIMA

    金属   66 ( 3 )   203 - 216   1996

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  • Synthesis of Metastable Tetragonal Phase in the CeO_2-ZrO_2 System by the Polymerized Complex Method

    YASHIMA M., OHTAKE K., KAKIHANA M., YOSHIMURA M.

    ( 26 )   34 - 35   1995.5

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  • Synthesis of LaMnO_<3+δ> by the Polymerized Complex Method

    ARIMA Momoko, KAKIHANA Masato, IKEDA Noriko, SUGITANI Yoshinori, YASHIMA Masatomo, YOSHIMURA Masahiro

    ( 26 )   164 - 165   1995.5

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  • SYNTHESIS OF PEROVSKITE-TYPE MULTICOMPONENT OXIDES BY POLYMERIZED COMPLEX METHOD

    ARIMA Momoko, KAKIHANA Masato, IKEDA Noriko, SUGITANI Yoshinori, YASHIMA Masatomo, YOSHIMURA Masahiro

    年報   93   119 - 120   1995.3

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    Perovskite-type multicomponent oxides such as BaTiO_3 and LaMnO_&lt;3+σ&gt;, have been synthesized by Polymerized Complex Method. Tetragonal BaTiO_3 with a small domain size formed at about 500℃ in air or 400℃ under O_2 flow. Throughout this process segregation of the individual metals was not observed. LaMnO_&lt;3+σ&gt; powder with high surface area (&gt;20m^2/g) was formed at about 500℃ in air or 350℃ under O2 flow.

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  • Oxygen‐induced structural change of the tetragonal phase around the tetragonal–cubic phase boundary in ZrO<inf>2</inf>–YO<inf>1.5</inf> solid solutions. Addendum

    M. Yashima, S. Sasaki, M. Kakihana, Y. Yamaguchi, H. Arashi, M. Yoshimura

    Acta Crystallographica Section B   51   381 - 381   1995.1

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  • THERMODYNAMIC ASSESSMENT OF THE ZRO2-LAO1.5 SYSTEM

    Y DU, M YASHIMA, T KOURA, M KAKIHANA, M YOSHIMURA

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   15 ( 6 )   503 - 511   1995

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  • Polymerized Complex Synthesis of the Modulation-free (Bi, Pb)2 Sr2(Ca, R)Cu2O8+d (R: Rare Earth=Y)

    Masato Kakihana, Minoru Osada, Masatomo Yashima, Masahiro Yoshimura, Toshiya Abiko, Sugitani Yoshinori, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   42 ( 6 )   735 - 740   1995

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  • Tetragonal—Monoclinic Phase Transition Enthalpy and Temperature of ZrO2‐CeO2 Solid Solutions

    Masatomo Yashima, Takefumi Mitsuhashi, Hiroyuki Takashina, Masato Kakihana, Takayasu Ikegami, Masahiro Yoshimura

    Journal of the American Ceramic Society   78 ( 8 )   2225 - 2228   1995

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  • (依頼解説) 「ジルコニア(ZrO2)系材料の基礎と応用」 Invited

    Masatomo YASHIMA

    新素材,   6 ( 1 )   52 - 58   1995

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  • (依頼講義のテキスト) 八島正知，セミナー講習会テキスト：「これだけは知ってほしい状態図」 Invited

    Masatomo YASHIMA

    平成7年度セラミックス大学テキストA   16 - 25   1995

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  • Raman Scattering from Co-substituted YBa2Cu3-xCoxO6+y Superconductors

    Hirotaka Fujimori, Masato Kakihana, Masatomo Yashima, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   42 ( 7 )   792 - 797   1995

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  • Structural changes of ZrO2-CeO2 solid solutions around the monoclinic-tetragonal phase boundary

    Masatomo Yashima, Teruo Hirose, Susumu Katano, Yasuo Suzuki, Masato Kakihana, Masahiro Yoshimura

    Physical Review B   51 ( 13 )   8018 - 8025   1995

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  • (日本金属学会奨励賞受賞記念総説記事) "ジルコニアセラミックスの相転移と状態図"

    八島正知, 吉村昌弘

    日本金属学会報マテリア   34 ( 4 )   448 - 454   1995

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  • Phase Transitions and Phase Diagram of Zirconia Ceramics.

    Yashima Masatomo, Yoshimura Masahiro

    Materia Japan   34 ( 4 )   448 - 454   1995

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    Language：Japanese   Publisher：The Japan Institute of Metals and Materials  

    DOI： 10.2320/materia.34.448

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  • CATIO3 COATING ON TIAL BY HYDROTHERMAL ELECTROCHEMICAL TECHNIQUE

    M YOSHIMURA, W URUSHIHARA, M YASHIMA, M KAKIHANA

    INTERMETALLICS   3 ( 2 )   125 - 128   1995

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  • 29a-P-4 Local structure in defect-flourite-type oxides R_3TaO_7(R=Y, Ta)

    Makino H, Mori S, Yamamoto N, Yano T, Ishizawa N, Yashima M, Yoshimura M

    Meeting Abstracts of the Physical Society of Japan   1995 ( 0 )   544 - 544   1995

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  • Complex susceptibilities of Ca-substituted YBa_2Cu_3O_y synthesized by the polymerized complex method

    Mazaki H, Yasuoka H, Tochihara S, Nasuno Y, Kakihara M, Osada M, Yashima M, Yoshimura M

    Meeting Abstracts of the Physical Society of Japan   1995 ( 0 )   385 - 385   1995

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  • Room‐Temperature Preparation of Highly Crystallized Luminescent SrWO4 Film by an Electrochemical Method

    Woo‐Seok Cho, Masatomo Yashima, Masato Kakihana, Akihiko Kudo, Tadayoshi Sakata, Masahiro Yoshimura

    Journal of the American Ceramic Society   78 ( 11 )   3110 - 3112   1995

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  • Effect of Dopant Species on Tetragonal (t′)‐to‐Monoclinic Phase Transformation of Arc‐Melted ZrO2‐RO,1.5 (R = Sm, Y, Er, and Sc) in Water at 200°C and 100 MPa Pressure

    Masatomo Yashima, Tomoo Nagatome, Tatsuo Noma, Nobuo Ishizawa, Yasuo Suzuki, Masahiro Yoshimura

    Journal of the American Ceramic Society   78 ( 8 )   2229 - 2232   1995

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  • Biocompatible whiskers with controlled morphology and stoichiometry

    Wojciech Suchanek, Hiroyuki Suda, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Journal of Materials Research   10 ( 3 )   521 - 529   1995

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  • ANOMALOUS BEHAVIOR OF THE 147 CM(-1) CU(2) RAMAN MODE IN YBA2CU4O8 UNDER HIGH-PRESSURE - SIGNATURE OF CHANGE IN THE ELECTRONIC-STATE OF THE CUO2 PLANE

    M KAKIHANA, H ARASHI, M YASHIMA, M YOSHIMURA, L BORJESSON, M KALL

    PHYSICA C   230 ( 1-2 )   199 - 206   1994.9

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  • THERMODYNAMIC EVALUATION OF THE ZRO2-CEO2 SYSTEM

    Y DU, M YASHIMA, T KOURA, M KAKIHANA, M YOSHIMURA

    SCRIPTA METALLURGICA ET MATERIALIA   31 ( 3 )   327 - 332   1994.8

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  • 耐火物の基礎科学--構成成分の結晶化学と物性--ジルコニア(ZrO2)-2-基礎-2-(実践的耐火物講座)

    八島 正知, 垣花 真人, 吉村 昌弘

    耐火物   46 ( 3 )   p150 - 156   1994.3

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  • 耐火物の基礎科学--構成成分の結晶化学と物性--ジルコニア(ZrO2)-1-基礎(実践的耐火物講座)

    八島 正知, 垣花 真人, 吉村 昌弘

    耐火物   46 ( 2 )   p91 - 98   1994.2

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  • Oxygen‐induced structural change of the tetragonal phase around the tetragonal–cubic phase boundary in ZrO<inf>2</inf>–YO<inf>1.5</inf> solid solutions

    M. Yashima, S. Sasaki, M. Kakihana, Y. Yamaguchi, H. Arashi, M. Yoshimura

    Acta Crystallographica Section B   50   663 - 672   1994.1

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  • Zirconia-13 mol % calcia solid solution synthesis by the polymerized complex and coprecipitation routes

    M. Yashima, K. Ohtake, M. Kakihana, M. Yoshimura

    Journal of Materials Science Letters   13 ( 21 )   1564 - 1566   1994.1

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    DOI： 10.1007/BF00626510

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  • Structural changes and redistribution of holes in Ca-doped YBa2Cu4O8

    Pedro Berastegui, Masato Kakihana, Sten G. Eriksson, Shigeru Nishio, Hiromasa Mazaki, Hiroshi Yasuoka, Minoru Osada, Masatomo Yashima, Masahiro Yoshimura

    Physica C: Superconductivity and its applications   235-240 ( 1 )   377 - 378   1994

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  • Effective Ionic Radius of Y3+ Determined from Lattice Parameters of Fluorite‐Type HfO2 and ZrO2 Solid Solutions

    Dae‐Joon Kim, Sang‐Hoon Hyun, Seung‐Goo Kim, Masatomo Yashima

    Journal of the American Ceramic Society   77 ( 2 )   597 - 599   1994

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  • 「耐火物の基礎科学：構成成分の結晶化学と物性」，ジルコニア（ZrO2） その１ （基礎）」

    八島正知, 垣花眞人, 吉村昌弘

    耐火物   46 ( 2 )   91 - 98   1994

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  • Comment on “Thermodynamic Properties of Cerium Oxalate and Cerium Oxide”

    Yong Du, Masatomo Yashima, Masato Kakihana, Toshiaki Koura, Masahiro Yoshimura

    Journal of the American Ceramic Society   77 ( 10 )   2783 - 2784   1994

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  • Raman Scattering Study of Cubic–Tetragonal Phase Transition in Zr1−xCexO2 Solid Solution

    Masatomo Yashima, Haruo Arashi, Masato Kakihana, Masahiro Yoshimura

    Journal of the American Ceramic Society   77 ( 4 )   1067 - 1071   1994

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  • 「耐火物の基礎科学：構成成分の結晶化学と物性，ジルコニア「ZrO2」基礎編その2」

    八島正知, 垣花眞人, 吉村昌弘

    耐火物   46 ( 3 )   150 - 156   1994

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  • 「特集講座 モノづくりとスペクトロスコピー 第５講 酸化物超伝導体をつくる-化学合成とラマン散乱-」

    垣花眞人, 八島正知, 吉村昌弘

    分光研究   43 ( 5 )   320 - 336   1994

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  • Looking at New Materials V.Synthesis and Raman Scattering of Superconductors.:V. Synthesis and Raman Scattering of Superconductors

    KAKIHANA Masato, YASHIMA Masatomo, YOSHIMURA Masahiro

    Bunko Kenkyu   43 ( 5 )   320 - 336   1994

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    Language：Japanese   Publisher：The Spectroscopical Society of Japan  

    DOI： 10.5111/bunkou.43.320

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  • Phonon Raman Scattering of the Modulation-free (Bi, Pb)2Sr2(Ca, R)Cu2Oz+aby Simultaneous Substitution of Bi by Pb and Ca by R (R: Rare earth-Y)

    Minoru Osada, Masato Kakihana, Masatomo Yashima, Masahiro Yoshimura

    journal of the japan society of powder and powder metallurgy   41 ( 12 )   1487 - 1491   1994

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    DOI： 10.2497/jjspm.41.1487

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  • Low‐Temperature Phase Equilibria by the Flux Method and the Metastable–Stable Phase Diagram in the ZrO2–CeO2 System

    Masatomo Yashima, Hiroyuki Takashina, Masato Kakihana, Masahiro Yoshimura

    Journal of the American Ceramic Society   77 ( 7 )   1869 - 1874   1994

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  • Phonon Raman Scattering of the Modulation-free (Bi, Pb)2Sr2(Ca, R)Cu2Oz+aby Simultaneous Substitution of Bi by Pb and Ca by R (R: Rare earth-Y)

    Minoru Osada, Masato Kakihana, Masatomo Yashima, Masahiro Yoshimura

    journal of the japan society of powder and powder metallurgy   41 ( 12 )   1487 - 1491   1994

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  • Raman spectroscopic evidence of site-selective isotopic substitution of oxygen in Bi2Sr2Ca0.8Y0.2Cu2O8+δ and mode assignments of oxygen vibrations

    Byung-Kook Kim, Masato Kakihana, Masatomo Yashima, Masahiro Yoshimura, Soon-Ja Park, Hiro-O Hamaguchi

    Physical Review B   49 ( 21 )   15388 - 15391   1994

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  • Synthesis of Metastable Tetragonal (t′) Zirconia–Ceria Solid Solutions by the Polymerized Complex Method

    Masatomo Yashima, Katsuya Ohtake, Masato Kakihana, Masahiro Yoshimura

    Journal of the American Ceramic Society   77 ( 10 )   2773 - 2776   1994

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  • DETERMINATION OF CUBIC-TETRAGONAL PHASE-BOUNDARY IN ZR1-XYXO2-X/2 SOLID-SOLUTIONS BY RAMAN-SPECTROSCOPY

    M YASHIMA, K OHTAKE, H ARASHI, M KAKIHANA, M YOSHIMURA

    JOURNAL OF APPLIED PHYSICS   74 ( 12 )   7603 - 7605   1993.12

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    DOI： 10.1063/1.354989

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  • The tetragonal ↔ monoclinic phase transition temperature of rare-earth-doped zirconia prepared by arc melting

    Mastomo Yashima, Nobuo Ishizawa, Tatsuo Noma, Mashiro Yoshimura

    Journal of the Ceramic Society of Japan. International ed.   101   847 - 852   1993.8

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  • Tetragonal&rlarr;Monoclinic Phase Transition Temperature of Rare-Earth-Doped Zirconia Prepared by Arc Melting

    YASHIMA Masatomo, ISHIZAWA Nobuo, NOMA Tatsuo, YOSHIMURA Masahiro

    Journal of the Ceramic Society of Japan   101 ( 1176 )   871 - 876   1993.8

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    The tetragonal (t)&amp;rlarr;monoclinic (m) phase transition temperature of compositionally homogeneous arc-melted ZrO_2-RO_&lt;1.5&gt; solid solutions (R=Nd, Sm, Er, Yb and Sc) was investigated by TMA (thermomechanical analysis; dilatometer) and high-temperature X-ray diffraction. The t&amp;rlarr;m transition was observed in ZrO_&lt;2-x&gt; mol% RO_&lt;1.5&gt; (x=0, 2 and 4 for R=Nd, Sm, Er and Yb, and x=2, 4, 6 for R = Sc), but not in specimens with higher dopant content. The equilibrium temperature T_0^&lt;t-m&gt; between t-and m-phases decreased linearly with an increase of dopant content x, the degree of which |dT_0/dx| was larger for dopants with larger ionic radii.

    DOI： 10.2109/jcersj.101.871

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  • APPLICATION OF AN ION-PACKING MODEL-BASED ON DEFECT CLUSTERS FOR LATTICE-PARAMETERS AND LOCAL STRUCTURES OF STABILIZED ZIRCONIA

    M YASHIMA, N ISHIZAWA, M YOSHIMURA

    JOURNAL OF ALLOYS AND COMPOUNDS   192 ( 1-2 )   69 - 71   1993.2

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  • ELECTRICAL-PROPERTIES OF DEFECT-FLUORITE PHASE IN THE SYSTEM R2O3-TA2O5 (R=GD, Y, ER AND YB)

    S KIM, M YASHIMA, M KAKIHANA, M YOSHIMURA

    JOURNAL OF ALLOYS AND COMPOUNDS   192 ( 1-2 )   72 - 74   1993.2

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  • Electron microscopic observation of rapidly cooled ZrO2-3 mol% Sm2O3 from the melt

    M. Hayakawa, Y. Onda, M. Oka, M. Yoshimura, M. Yashima

    Journal of Materials Science   28 ( 22 )   6066 - 6069   1993.1

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    DOI： 10.1007/BF00365022

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  • High‐Temperature X‐ray Study of the Cubic‐Tetragonal Diffusionless Phase Transition in the ZrO2─ErO1.5 System: I, Phase Change between Two Forms of a Tetragonal Phase, t′‐ZrO2 and t″‐ZrO2, in the Compositionally Homogeneous 14 mol% ErO1.5‐ZrO2

    Masatomo Yashima, Nobuo Ishizawa, Masahiro Yoshimura

    Journal of the American Ceramic Society   76 ( 3 )   641 - 648   1993

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  • Characterization of Co-Substituted YBa2Cu3O7-d Superconductors by Raman Spectroscopy —Application of Raman Spectroscopy to High-Tc Superconductors (1)—

    Masato Kakihana, Hirotaka Fujimori, Masatomo Yashima, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 11 )   1101 - 1106   1993

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    DOI： 10.2497/jjspm.40.1101

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  • Polymerized Complex Synthesis and Post-O2 HIP Treatment of YBa2-xSrxCu4Oy Superconductors

    Masato Kakihana, Masatomo Yashima, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 2 )   156 - 160   1993

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    DOI： 10.2497/jjspm.40.156

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  • ZrO2-YO1.5固溶体における正方-立方相境界付近の正方相の構造変化

    八島 正知, 山口 泰男, 佐々木 聡, 嵐 治夫, 垣花 眞人, 吉村 昌弘

    日本結晶学会誌   35 ( 0 )   80 - 80   1993

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    Language：Japanese   Publisher：日本結晶学会  

    DOI： 10.5940/jcrsj.35.Supplement_80

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  • Synthesis of High-Purity YBa2Cu3O7-d Superconductors by Polymerized Complex Method

    Masato Kakihana, Hirotaka Fujimori, Masatomo Yashima, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 10 )   982 - 986   1993

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    DOI： 10.2497/jjspm.40.982

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  • Zirconia–Ceria Solid Solution Synthesis and the Temperature–Time–Transformation Diagram for the 1:1 Composition

    Masatomo Yashima, Kenji Morimoto, Nobuo Ishizawa, Masahiro Yoshimura

    Journal of the American Ceramic Society   76 ( 7 )   1745 - 1750   1993

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  • Hydrothermal Corrosion of CVD Coated TiC, TiN, TiCN, TiCNO Films

    Yoshinori Kanno, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Journal of the Society of Materials Science, Japan   42 ( 478 )   780 - 783   1993

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  • Hydrothermal Corrosion of CVD Coated TiC, TiN, TiCN, TiCNO Films

    Yoshinori Kanno, Masatomo Yashima, Masato Kakihana, Masahiro Yoshimura

    Journal of the Society of Materials Science, Japan   42 ( 478 )   780 - 783   1993

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    Language：English   Publisher：The Society of Materials Science, Japan  

    DOI： 10.2472/jsms.42.780

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  • Effects of Mineralizers on PbTiO3 Films Prepared by Hydrothermal Method

    Woo-Seok Cho, Masato Kakihana, Masatomo Yashima, Masahiro Yoshimura, Masao Kumagai

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 10 )   973 - 977   1993

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  • Characterization of Co-Substituted YBa2Cu3O7-d Superconductors by Raman Spectroscopy —Application of Raman Spectroscopy to High-Tc Superconductors (1)—

    Masato Kakihana, Hirotaka Fujimori, Masatomo Yashima, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 11 )   1101 - 1106   1993

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  • (Invited Review) Application of Raman Spectroscopy to Phase Characterization of Ceramic High-Tc Superconductors and Zirconia Related Materials"

    M. Yashima, M. Yoshimura, L. Börjesson, M. Kall

    Trends in Applied Spectroscopy   1   261 - 311   1993

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  • High‐Temperature X‐ray Study of the Cubic–Tetragonal Diffusionless Phase Transition in the ZrO2─ErO1.5System: II, Temperature Dependences of Oxygen Ion Displacement and Lattice Parameter of Compositionally Homogeneous 12 mol% ErO1.5─ZrO2

    Masatomo Yashima, Nobuo Ishizawa, Masahiro Yoshimura

    Journal of the American Ceramic Society   76 ( 3 )   649 - 656   1993

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  • Tetragonal ⇔ monoclinic phase transition temperature of rare-earth-doped zirconia prepared by arc melting

    Masatomo Yashima, Nobuo Ishizawa, Tatsuo Noma, Masahiro Yoshimura

    Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan   101 ( 1176 )   871 - 876   1993

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  • Polymerized Complex Synthesis and Post-O2 HIP Treatment of YBa2-xSrxCu4Oy Superconductors

    Masato Kakihana, Masatomo Yashima, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 2 )   156 - 160   1993

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  • Diffusionless Tetragonal–Cubic Transformation Temperature in Zirconia–Ceria Solid Solutions

    Masatomo Yashima, Kenji Morimoto, Nobuo Ishizawa, Masahiro Yoshimura

    Journal of the American Ceramic Society   76 ( 11 )   2865 - 2868   1993

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  • Synthesis of High-Purity YBa2Cu3O7-d Superconductors by Polymerized Complex Method

    Masato Kakihana, Hirotaka Fujimori, Masatomo Yashima, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka

    Journal of the Japan Society of Powder and Powder Metallurgy   40 ( 10 )   982 - 986   1993

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  • 26p-PSB-43 Changes in the Local Structure around Cu of Bi 2212 Phases by Raman Scattering

    Murakoshi Y, Sekine R, Kakihana M, Yashima M, Kawai M, Kudo M

    Meeting Abstracts of the Physical Society of Japan   1992 ( 0 )   344 - 344   1992

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  • 「融体超急冷した希土類添加ジルコニアにおける生成相」

    八島正知, 吉村昌弘

    ジルコニアセラミックス１２   21 - 46   1992

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  • Thermodynamical models for phase changes between tetragonal and cubic phases in zro2-ceo2 solid solution

    Masatomo Yashima, Masahiro Yoshimura

    Japanese Journal of Applied Physics   31 ( 11 )   L1614 - L1617   1992

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  • Application of an Ion‐Packing Model Based on Defect Clusters to Zirconia Solid Solutions: II, Applicability of Vegard's Law

    Masatomo Yashima, Nobuo Ishizawa, Masahiro Yoshimura

    Journal of the American Ceramic Society   75 ( 6 )   1550 - 1557   1992

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  • Application of an Ion‐Packing Model Based on Defect Clusters to Zirconia Solid Solutions: I, Modeling and Local Structure of Solid Solutions

    Masatomo Yashima, Nobuo Ishizawa, Masahiro Yoshimura

    Journal of the American Ceramic Society   75 ( 6 )   1541 - 1549   1992

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  • Effects of Noncompositional Inhomogeneity on t→m Phase Transformation During Grinding of Various Rare‐Earth‐Doped Zirconias

    Masatomo Yashima, Tatsuo Noma, Nobuo Ishizawa, Masahiro Yoshimura

    Journal of the American Ceramic Society   74   3011 - 3016   1991.1

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  • Stable and Metastable Phase Relationships in the System ZrO2–ErO1.5

    Masatomo Yashima, Nobuo Ishizawa, Tatsuo Noma, Masahiro Yoshimura

    Journal of the American Ceramic Society   74 ( 3 )   510 - 513   1991

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  • FORMATION OF DIFFUSIONLESSLY TRANSFORMED TETRAGONAL PHASES BY RAPID QUENCHING OF MELTS IN ZRO2 RARE EARTHSO1.5 SYSTEMS

    M YOSHIMURA, M YASHIMA, T NOMA, S SOMIYA

    JOURNAL OF MATERIALS SCIENCE   25 ( 4 )   2011 - 2016   1990.4

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  • ホタル石型構造に対する価電子力場法の試行

    八島 正知, 石澤 伸夫, 吉村 昌弘

    日本結晶学会誌   31 ( 0 )   PB - 34-PB-34   1989

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    Language：Japanese   Publisher：日本結晶学会  

    DOI： 10.5940/jcrsj.31.Supplement_PB-34

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  • 「超急冷法によって作製したＹ−ＴＺＰの相変態特性」

    野間竜男, 吉村昌弘, 八島正知, 宗宮重行

    ジルコニアセラミックス１０   185 - 194   1989

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  • Formation and Phase Stability of Tetragonal Phase in Rapidly Quenched RO1.5-ZrO2 (R: Rare Earth)

    M. Yoshimura, M. Yashima, T. Noma, S. Somiya

    Proceedings of MRS International Meeting on Advanced Materials   3 ( 545-550 )   1989

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  • Formation and Phase Stability of Tetragonal Phase in Rapidly Quenched ZrO2-ErO1.5

    Masahiro Yoshimura, Masatomo Yashima, Tatsuo Noma, Shigeyuki S̳miya

    Japanese Journal of Applied Physics   27 ( 9 A )   L1757 - L1760   1988

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Presentations

  • (Keynote Lecture)DISCOVERY of HIGH PROTON and OXIDE-ION CONDUCTORS via INTRINSIC OXYGEN VACANCIES Invited

    Masatomo Yashima

    24th International Conference On Solid State Ionics (SSI-24)  2024.7 

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  • (Invited Lectures)High oxide-ion conductivity by the overbonded channel oxygens in Si-deficient La9.565(Si5.826□0.174)O26 apatite without interstitial oxygens Invited

    Masatomo Yashima, Kotaro Fujii, Keisuke Hibino, Eiki Niwa, Masahiro Shiraiwa, Koichiro Fukuda, Susumu Nakayama, Nobuo Ishizawa, Takayasu Hanashima, Takashi Ohhara

    2019.1 

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  • (Invited Lectures)Recent Research Progress by the Tokyo Institute of Technology Group Invited

    Masatomo YASHIMA, K. Fujii. E. Niwa, M. Shiraiwa, K. Hibino, W. Zhang

    Solid Oxide Interfaces for Faster Ion Transport (SOIFIT) The 4nd Quarterly SOIFIT Meeting  2018.7 

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  • (Keynote)Precise Crystal Structure Analysis and Structure-Based Design of Ceramic Materials Invited

    Masatomo YASHIMA, Kotaro Fujii, Eiki Niwa, Masahiro Shiraiwa, Keisuke Hibino, Ayaka Fujimoto

    4th Global Congress & Expo on Materials Science and Nanoscience  2018.10 

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  • (Keynote)Precise Crystal Structure, Phase Transformation and Properties of Ceramic Materials Invited

    Masatomo YASHIMA

    2nd International Conference and Expo on Condensed Matter Physics  2018.10 

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  • (Keynote)Ion-Diffusion Mechanism and Exploration of New Structure-Type Ion Conductors Invited

    Masatomo YASHIMA, Kotaro Fujii, Eiki Niwa

    19th International Union of Materials Research Societies International Conference in Asia (IUMRS-ICA)  2018.10 

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  • (Invited Lecture)Origin of the high oxide-ion conductivity in the apatite-type lanthanum silicates Invited

    Kotaro Fujii, Masatomo Yashima

    AsCA2018  2018.12 

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  • (Keynote) Visualization of the Ion-Diffusion Path and Chemical Bonding in Inorganic Materials Invited

    Masatomo YASHIMA

    16th International Conference and Exhibition on Pharmaceutical Formulations  2018.7 

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  • (Invited Lectures)New Material Exploration and Ion-Diffusion Mechanism of Ionic Conductors Invited

    Masatomo YASHIMA, Kotaro Fujii, Eiki Niwa

    Seminar at Prof. Malavasi group, Pavia University, Italy  2018.7 

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  • (Invited Lectures)Crystal Structure and Properties of Ceramic Materials (Tentative) Invited

    Masatomo YASHIMA

    9th International Petra School of Physics  2018.10 

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  • (Invited Lectures)Ion-Diffusion Mechanism and Exploration of New Structure-Type Ion Conductors (Tentative) Invited

    Masatomo YASHIMA

    9th International Petra School of Physics  2018.10 

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  • (招待講演)粉末・単結晶中性子回折による酸化物イオン伝導体と複合アニオン化合物の探索と構造科学 Invited

    八島正知, 藤井孝太郎

    日本セラミックス協会2019年年会サテライトミーティング「第1回新材料の開発を目指した構造科学研究会」  2019.3 

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  • （招待講演)単結晶中性子回折法によるアパタイト型材料の高酸化物イオン伝導の構造的要因解明 Invited

    藤井孝太郎, 八島正知, 日比野圭佑, 白岩大裕, 中山享, 福田功一郎, 石澤伸夫, 花島隆泰, 大原高志

    日本セラミックス協会2019年年会サテライトミーティング「第1回新材料の開発を目指した構造科学研究会」  2019.3 

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  • (招待講演)X 線、中性子、シンクロトロン光を用いた回折法の基礎から応用まで Invited

    八島正知

    豊橋技術科学大学教育研究基盤センター ユーザーズセミナー  2019.8 

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  • (Plenary Lecture)Exploration and Ion-Diffusion Mechanism of New Structure-Type Ion Conductors Invited

    Masatomo Yashima, Kotaro Fujii, Taito Murakami, Wenrui Zhang, Yuta Yasui

    International Conference on Material Science and Engineering  2019.8 

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  • (招待講演)機能性セラミックスの精密構造解析による構造物性 Invited

    藤井孝太郎

    日本セラミックス協会関西支部第22回若手フォーラム  2019.10 

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  • (Invited Lectures)Structure, electron density and diffusion path of mixed-anion compounds and oxides Invited

    Masatomo Yashima, Keisuke Hibino, Takafumi Tsujiguchi, Kotaro Fujii, Taito Murakami, Kazuhiko Maeda

    The 13th Pacific Rim Conference of Ceramic Societies  2019.10 

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  • (Invited Lectures)Exploration of new ion conductors and structure science of ion conductors Invited

    Kotaro Fujii, Masatomo Yashima

    International Conference on Solid State Ionics (SSI-22)  2019.6 

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  • (招待講演)放射光・中性子の利用，MEM解析の実例 Invited

    八島正知

    日本結晶学会講習会「粉末X線解析の実際2019」  2019.7 

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  • (Invited Lectures)High oxide-ion conductivity by the overbonded channel oxygens in Si-deficient La9.565(Si5.826Va0.174)O26 apatite without interstitial oxygens Invited

    M. Yashima, K. Fujii

    2nd Global Forum on Advanced Materials and Technologies for Sustainable Development (GFMAT-2)  2019.7 

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  • (招待講演)新構造型イオン伝導体の探索と構造物性 Invited

    八島正知

    第15回 新機能無機物質探索研究センター・シンポジウム  2019.8 

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  • (Invited Lectures)Structure science of oxide-ion conductors - exploration of new oxide-ion conductors and investigation of oxide-ion conduction mechanisms - Invited

    Kotaro Fujii, Masatomo Yashima

    The 13th Pacific Rim Conference of Ceramic Societies  2019.10 

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  • （招待講演）本質的な酸素欠損層を持つ新型プロトン伝導体の発見 Invited

    村上泰斗, 八島正知, James R. Hester

    日本セラミックス協会第33回秋季シンポジウム  2020.9 

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  • (Keynote)Material Exploration and Diffusion Mechanism of New Ion Conductors by Bond-Valence Method Invited

    Masatomo Yashima, Kotaro Fujii, Taito Murakami, Wenrui Zhang, Masahiro Shiraiwa, Hiroshi Yaguchi, Yuta Yasui

    2021.3 

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  • （Invited Lectures）Exploration and Diffusion Mechanism of High Oxide-Ion and Proton Ceramic Conductors Invited

    Masatomo Yashima, Kotaro Fujii

    23rd International Conference on Solid State Ionics(SSI-23)  2022.7 

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  • （基調講演）多様な元素と構造に基づいた新型材料のデザイン イオン伝導体に焦点を当てて Invited

    八島正知, 藤井孝太郎, 張文鋭

    日本セラミックス協会第35回秋季シンポジウム  2022.9 

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  • （招待講演）高イオン伝導体の探索と構造解析 Invited

    八島正知, 藤井孝太郎, 張文鋭

    日本セラミックス協会第35回秋季シンポジウム  2022.9 

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  • (Invited) Discovery of Dion-Jacobson-type oxide-ion conductors by screening through Bond-Valence-based energy calculations, synthesis, and characterization of structural and transport properties Invited

    Wenrui Zhang, Kotaro Fujii, Masatomo Yashima

    2021.3 

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  • （招待講演）本質的な酸素欠損層と八面体配列によるプロトン伝導体のデザイン Invited

    八島 正知

    第79回固体イオニクス研究会 「プロトン伝導体の研究最前線」  2021.11 

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  • （招待講演）高イオン伝導体の探索 Invited

    八島正知, 藤井孝太郎, 村上泰斗, 張文鋭, 安井雄太, 作田祐一, 矢口寛

    第60回セラミックス基礎科学討論会  2022.1 

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  • (Invited Lectures) Ion-Diffusion Mechanism and New Material Exploration of Ionic Conductors Invited

    Masatomo Yashima

    2022.1 

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  • （依頼講演）新規酸化物イオン伝導体 CsBi2Ti2NbO10-δの発見とドーピングによるイオン伝導度の向上 Invited

    張文鋭, 藤井孝太郎, 八島正知

    日本セラミックス協会第35回秋季シンポジウム  2022.9 

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  • (Invited Lectures)Experimental Visualization of the Ion-Migration Pathways of Ion Conductors via in situ Neutron Diffractometry Invited

    Masatomo Yashima

    Structure and Thermodynamics of Oixdes/Carbides/Nitrides/Boraides at High Temperature  2022.10 

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  • ( Invited Lectures)Search for High Ionic Conductors and their Mechanism Invited

    Masatomo Yashima

    JSPS Core-To-Core Program, Solid Oxide Interfaces for Faster Ion Transport, Final Seminar  2023.2 

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  • (Invited Lecture) Exploration and Structure Analysis of High Ion Conductors Invited

    Masatomo Yashima

    The 13th "Next generation Zirconia Seminar"  2023.5 

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  • (Keynote Lecture)Exploration and Precise Structure Analysis of Novel Materials Exhibiting High Ion Conductivity and Chemical Stabilit Invited

    Masatomo Yashima

    Advanced Materials Research Grand Meeting MRM2023 IUMRS-ICA2023  2023.12 

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  • (Keynote Speech)Structural Analysis and Design of Novel Ion Conductors Invited

    Masatomo Yashima

    2023.5 

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  • (Invited Lecture) High Proton Conduction by Intrinsic Oxygen Vacancies in Oxides Invited

    2023.9 

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  • (Keynote Speech)Search for High Ion Conductors and their Crystal Structure Analyses Invited

    Masatomo Yashima

    2023.11 

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  • (Plenary Lecture) (Tentative Title) Exploration of High Ion Conductors Invited

    Masatomo Yashima

    The 49th Symposium on Solid State Ionics of Japan  2023.11 

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  • (CSJ Award for Creative Works)Precise Structure Analysis and Exploration of Functional Inorganic Materials Invited

    Masatomo YASHIMA

    The 98th CSJ Annual Meeting  2018.3 

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  • (Keynote)Ion-Diffusion Mechanism and Explanation of New Structure-Type Ion Conductors Invited

    Masatomo YASHIMA, Kotaro Fujii, Eiki Niwa

    3rd Global Congress & Expo on Materials Scince & Engineering  2018.6 

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  • (Invited Lectures) Exploration of a New Structure Family of Oxide-Ion Conductors BaSc2Si3O10 by the Bond Valence Method and Experiments Invited

    Eiki Niwa, Kotaro Fujii, Masatomo YASHIMA

    2018 Collacorative Conference on Matrials Research (CCMR 2018)  2018.6 

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  • (Invited Lectures)新セラミックイオン伝導体とイオン‐電子混合伝導体の精密構造解析とデザイン Invited

    Masatomo YASHIMA, Kotaro Fujii, Eiki Niwa, Masahiro Shiraiwa, Keisuke Hibino, Wenrui Zhang

    BIT’s 4th Annual World Congress of SmartMaterials -2018(WCSM-2018)  2018.3 

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  • (Invited Lectures)Precise Structure Analysis and Design of Novel Ceramic Ion Conductors and Ion-Electron Mixed Conductors Invited

    Masatomo YASHIMA, Kotaro Fujii, Eiki Niwa, Masahiro Shiraiwa, Keisuke Hibino, Wenrui Zhang

    BIT’s 4th Annual World Congress of Smart Materials-2018 (WCSM-2018)  2018.3 

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  • （受賞講演）結合原子価法による新構造型イオン伝導体の探索 Invited

    丹羽栄貴

    電気化学会第85回大会  2018.3 

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  • （受賞講演）機能性セラミックスの精密構造解析と新構造型イオン伝導体の発見 Invited

    藤井孝太郎

    日本セラミックス協会2018年年会  2018.3 

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  • (Invited Talk)Phase Transformations of Ceramics Studied by High-Temperature Neutron and Synchrotron X-ray Diffraction Invited

    Masatomo YASHIMA

    104TH ANNUAL MEETING & EXPOSITION  2002.4 

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  • (Invited Talk)Temperature dependence of crystal structure of ceramic materials studied by neutron and synchrotron powder diffractometry Invited

    Masatomo YASHIMA

    3rd Japan-Korea meeting on neutron scattering  2003.2 

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  • (Invited Talk) Disorder and Conduction Path of Oxide Ions in Ion Conductors Invited

    Masatomo YASHIMA

    Workshop on High-Temperature Superconductors and Novel Inorganic Materials  2004.6 

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  • (Invited Talk)Precise structural analysis and phase transformation of inorganic materials through high-temperature neutron and synchrotron powder diffractometry Invited

    Masatomo YASHIMA

    International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005  2005.5 

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  • (Invited Talk)Metastable Phase Diagram: Construction and Prediction of Phase Selection in Various Ceramic Processing Invited

    Masatomo YASHIMA

    Annual Meeting of American Ceramic Society  1996 

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  • (Invited Talk)Phase Diagram Implications for Solid Oxide Fuel Cells Invited

    Masatomo YASHIMA, M. Kakihana, M. Yoshimura

    PacRim2  1996 

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  • (Invited Talk)In-Situ Observations of Phase Transition by High-Temperature Neutron and Synchrotron X-ray Diffraction Invited

    Masatomo YASHIMA

    PacRim4  2001 

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  • (Plenary Lecture)Detection of Chemical Bonding and ion Diffusion Pathway in Ceramic Materials by Powder Diffractometry Invited

    Masatomo YASHIMA, K. Fujii

    BIT’s 4th Annual Conference & EXPO of AnalytiX2015  2015.4 

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  • (Invited Lectures)Discovery of a New Structure Family of Oxide-Ion Conductor BaNdInO4 Invited

    Masatomo YASHIMA, K. Fujii, M. Shiraiwa, Y. Esaki

    11th International Conference on Ceramic Materials and Components for Energy and Environmental Applications (11th CMCEE)  2015.6 

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  • (Invited Lectures) Ion Diffusion Pathway, Chemical Bonding and Crystal Structure of Ceramic Materials through Neutron and Synchrotron X-ray Powder Diffraction Invited

    Masatomo YASHIMA, K. Fujii

    Neutron Diffraction Workshop, held at the National Synchrotron Radiation Research Center (NSRRC)  2015.6 

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  • （招待講演）新規酸化物イオン伝導体の結晶構造解析と伝導メカニズム Invited

    藤井孝太郎

    平成27年度物質科学研究会  2015.7 

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  • （受賞講演）未知構造解析を用いた有機結晶の反応機構の解明および酸化物イオン伝導性無機結晶の新物質探索 Invited

    藤井孝太郎

    日本結晶学会平成26年度年会および総会  2014.11 

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  • (招待講演）クリーンエネルギーのためのセラミック材料の結晶構造解析とデザイン Invited

    八島正知, 藤井孝太郎

    日本ファインセラミックス協会(JFCA) テクノフェスタ  2015.1 

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  • （基調講演）第１回構造科学と新物質探索研究会 「アパタイト型酸化物の結晶構造と酸化物イオン伝導とその機構: -現状、問題点と展望- Invited

    八島正知

    日本セラミックス協会 2015年年会  2015.3 

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  • （基調講演）X 線・中性子回折によるセラミック材料の機能解明と新材料開発 Invited

    藤井孝太郎

    第８回ワークショップ「固体材料合成および評価技術の新展開」  2015.9 

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  • (Plenary Lecture)Ceramic Materials for Clean Energy and Environment: Precise Crystal Structure and Properties Invited

    Masatomo YASHIMA

    9th International Conference on ENERGY and DEVELOPMENT, ENVIRONMENT and BIOMEDICINE (EDEB '15)  2015.9 

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  • （招待講演）エネルギー・環境材料の精密構造解析と新物質探索 Invited

    八島正知

    日本希土類学会第33回講演会  2015.11 

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  • (Invited Lectures)Precise Structure Analysis of Oxide Materials through Neutron and Synchrotron Powder Diffractometry up to 1830 K Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa, M. Shiraiwa, K. Hibino, K. Saito

    STRUCTURE and THERMODYNAMICS of OXIDES at HIGH TEMPERATURE (STOHT2016)  2016.10 

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  • (Invited Lectures)Precise Structure Analysis of Materials for Energy & Environment Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa, M. Shiraiwa, K. Hibino

    Collaborative Conference on 3D and Materials Research (CC3DMR) 2016  2016.6 

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  • (Invited Lectures) Novel Oxide-Ion Conductors based on a New Structure Family NdBaInO4 Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa, M. Shiraiwa, K. Hibino

    Collaborative Conference on 3D and Materials Research (CC3DMR) 2016  2016.6 

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  • (Invited Lectures) Atomic-scale characterization of ion conduction, structure and stability of ceria-based catalysts and related materials: Present status and problems Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa

    9th International Conference on High Temperature Ceramic Matrix Composites / Global Forum on Advanced Materials and Technologies for Sustainable Development  2016.6 

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  • (Invited Lectures)Precise Structure Analysis of Advanced Ceramic Materials through Powder Diffraction Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa

    9th International Conference on High Temperature Ceramic Matrix Composites / Global Forum on Advanced Materials and Technologies for Sustainable Development  2016.6 

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  • （招待講演）セリア-ジルコニア，セリア系材料およびセラミックイオン伝導体の結晶構造，電子構造，イオン拡散，相変態，状態図と材料設計 Invited

    八島正知, 藤井孝太郎, 丹羽栄貴

    第一稀元素化学工業株式会社第６０期研究開発討論会  2016.1 

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  • (Invited Lectures)Structure and chemical bonding of AgNbO3, BIFeO3 and BIFeO3-PbTiO3 electroceramics Invited

    Masatomo YASHIMA

    EMN Ceramics Meeting 2016  2016.1 

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  • (Invited Lectures)New Perovskite-Related Structure Family of Oxide-Ion Conducting Materials NdBaInO4 Invited

    K. Fujii, Masatomo YASHIMA

    Australia-Japan Workshop on Neutron Science  2016.3 

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  • (Invited Lectures) Structural Origin of the Anisotropic and Isotropic thermal Expansion of K2NiF4-Type Oxides Invited

    Masatomo YASHIMA

    Australia-Japan Workshop on Neutron Science  2016.3 

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  • (Invited Lectures) Atomic-scale characterization of ceria catalysts and ceramic ion conductors Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa

    Fundamentals and Applications of Cerium Dioxide in Catalysis (FACC-2016 Beijing)  2016.6 

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  • (Invited Lectures)Ion-diffusion Visualization and New Ionic Conductor Exploration Through Nuclear- and Electron-Density Studies Invited

    Masatomo YASHIMA, K. Fujii, M. Shiraiwa, Y. Esaki, K. Hibino, E. Niwa

    The 2016 E-MRS Fall Meeting  2016.9 

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  • (Invited Lectures)Facilities and Research at Tokyo Institute of Technology Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa

    JSPS Core-to-Core 1st Workshop on Solid Oxide Interfaces for Faster Ion Transport (SOIFIT)  2017.6 

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  • （招待講演）RIETAN-FPの入力 Invited

    八島正知

    結晶学会講習会 「粉末X線解析の実際」  2017.7 

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  • （招待講演）中性子とX線回折による複合アニオン化合物の構造解析 Invited

    八島正知

    「複合アニオン」キックオフミーティング・若手スクール  2017.5 

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  • (Invited Lectures)Precise Structure Analysis of Advanced Ceramic Materials through Powder Diffraction Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa, M. Shiraiwa, K. Hibino

    9rd International Conference on Materials for Advanced Technologies (ICMAT 2017)  2017.6 

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  • (Invited Lectures) Visualization of IonDiffusion Pathway by Diffraction Experiments Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa, M. Shiraiwa, K. Hibino

    9rd International Conference on Materials for Advanced Technologies (ICMAT 2017)  2017.6 

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  • (Invited Lectures)Exploration of a New Structure Family of Oxide-Ion Conductors by the Bond- Valence Method Invited

    E. Niwa, K. Fujii, Masatomo YASHIMA

    JSPS Core-to-Core 1st Workshop on Solid Oxide Interfaces for Faster Ion Transpo（SOIFIT)  2017.6 

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  • (Keynote)Structure, diffusion path and design of novel oxide-ion conductors Invited

    Masatomo YASHIMA, K. Fujii, M. Shiraiwa, K. Hibino, E. Niwa

    14th International Conference of the Asian Crystallographic Association(AsCA 2016)  2016.12 

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  • （招待講演）中性子およびX線回折によるイオン伝導経路と化学結合の可視化 Invited

    八島正知, 藤井孝太郎, 丹羽栄貴

    日本金属学会東海支部,日本鉄鋼協会東海支部学術討論会  2017.1 

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  • (Invited Lectures)Precise Structure Analysis of Nylysis of Inogranic Catalysts, Photocatalysts and Oxide-Ion Conductors Invited

    Masatomo YASHIMA, K. Fujii, M. Shiraiwa, K. Hibino, E. Niwa

    3rd International Conference on Molecular & Functional Catalysis (ICFMC-3)  2017.2 

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  • （招待講演）化学および固体化学への招待 基礎科学から産業と社会に貢献 Invited

    八島正知

    横浜サイエンスフロンティア高校出張講義「進路ガイダンス」  2017.4 

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  • (Invited Lectures)Visualization of the Ion Diffusion Pathway of Oxide-Ion Conductors Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa

    JSPS Core-to-Core 1st Workshop on Solid Oxide Interfaces for Faster Ion Transpo（SOIFIT)  2017.6 

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  • （招待講演）結晶構造に基づく物質科学 Invited

    藤井 孝太郎, 八島正知

    信越化学工業株式会社講演会  2017.11 

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  • （招待講演）機能性無機材料の構造研究におけるJRR-3とJ-PARCの利用 Invited

    八島正知, 藤井孝太郎, 丹羽栄貴, 白岩大裕, 日比野圭佑, 藤本絢香

    東北大学金属材料研究所ワークショップ  2017.11 

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  • （招待講演）新構造型酸化物イオン伝導体の探索 Invited

    藤井孝太郎, 丹羽栄貴, 八島正知

    第12回新機能無機物質探索研究センター・シンポジウム  2018.2 

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  • (Invited Lectures)New Perovskite-Related Structure Family of Oxide-Ion Conducting Materials BaNdInO4 Invited

    K. Fujii, M. Shiraiwa, E. Niwa, Masatomo YASHIMA

    Seminar at Imperial College London (Host: Professor Skinner)  2017.11 

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  • (Invited Lectures)Precise Structure Analysis of Materials for Energy and Environment, and Design of New Structure-Type Ion Conductors Invited

    Masatomo YASHIMA, K. Fujii, M. Shiraiwa, K. Hibino, E. Niwa, John A. Kilner

    Seminar at Imperial College London (Host: Professor Skinner)  2017.11 

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  • (Invited Lectures) Tokyo Institute of Technology Team Recent Research Activity and Facility Role in the JSPS Core-to-Core Program Invited

    Masatomo YASHIMAK. Fujii, E. Niwa, M. Shiraiwa, K. Hibino, Wenrui Zhao

    Solid Oxide Interfaces for Faster Ion Transport (SOIFIT), The 2nd Quarterly SOIFIT Meeting (SOIFIT London workshop 2017)  2017.11 

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  • （招待講演）イオン伝導体，排ガス浄化触媒，強誘電体の構造物性およびジルコニアセラミックスの状態図と相変態 Invited

    八島正知, 藤井孝太郎, 丹羽栄貴

    信越化学工業株式会社講演会  2017.11 

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  • （招待講演）結合原子価法による新構造型酸化物イオン伝導体の探索 Invited

    丹羽栄貴, 藤井孝太郎, 八島正知

    日本セラミックス協会第30回秋季シンポジウム  2017.9 

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  • (Invited Lectures)Crystal Structures, Phase Transformations and Properties of Ceramics Invited

    Masatomo YASHIMA, K. Fujii, E. Niwa

    MATERIAL SCIENCE & TECHNOLOGY 2017  2017.10 

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  • （招待講演）複合アニオン化合物が拓く蛍光体開発 Invited

    小林亮, 加藤英樹, 安永拓矢, 工藤春佳, 垣花眞人, 藤井孝太郎, 八島正知

    第7回 CSJ化学フェスタ2017  2017.10 

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  • (Invited Lectures)Crystal structure and oxide-ion conductivity of Ba1+xNd1-xInO4-x/2 Invited

    M. Shiraiwa, K. Fujii, Y. Esaki, Su Jae Kim, Seongsu LeeMasatomo YASHIMA

    Seminar at Imperial College London (Host: Professor Skinner)  2017.11 

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  • (Invited Talk)Crystal structure and diffusion path in ionic conductors Invited

    Masatomo YASHIMA

    ISCP-III  2005.8 

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  • (Invited Lecture)Crystal structural analysis and phase transition of ceramic materials through neutron and synchrotron powder diffractometry Invited

    Masatomo YASHIMA

    ISCP-III  2005.8 

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  • (Invited Talk) Precise structural analysis and phase transition of perovskite-related materials Invited

    Masatomo YASHIMA

    6th Pacific Rim Conference on Ceramic and Glass Technology  2005.9 

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  • (Keynote Lecture) Diffusion Path and Structural Disorder in Bulk Ionic Conductors through Diffraction Experiments Invited

    Masatomo YASHIMA

    16th International Conference on Solid State Ionics  2007.7 

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  • (Invited Lecture)(Invited Paper) Visualization of Chemical Bonding and Structural Disorders from Diffraction Experiments Invited

    Masatomo YASHIMA

    Aural Presentation at the International Conference on Contemporary Physics (ICCP-IV),  2007.8 

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  • (Invited Talk)Visualization of Chemical Bonding and Structural Disorders in Ceramic Materials through Synchrotron and Neutron Powder Diffraction Experiments Invited

    Masatomo YASHIMA

    International Symposium on Advanced Ceramics and Technology for Sustainable Energy Applications  2007.11 

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  • (Invited Talk) Diffusion Path and Disorder in Ionic Conductors from Diffraction Experiments Invited

    Masatomo YASHIMA

    6th Pacific Rim Conference on Ceramic and Glass Technology  2005.9 

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  • (Invited Talk)Diffusion path and disorder in bulk ionic conductors from diffraction experiments Invited

    Masatomo YASHIMA

    Faraday Discussion 134: Atomic Transport and Defect Phenomena in Solids  2006.7 

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  • (Invited Talk)Precise structural analysis and phase transition of inorganic materials through high-temperature neutron and synchrotron diffraction techniques Invited

    Masatomo YASHIMA

    19th General Meeting of the International Mineralogical Association (IMA2006-Kobe)  2006.7 

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  • (Invited Lecture)In Situ Study of Nuclear/Electron Density and Structural Change of Ceramic Materials at High Temperatures Invited

    Masatomo YASHIMA

    the International Symposium of Advanced Materials, Organized by Nagoya Institute of Technology  2006.10 

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  • (Invited Talk)Diffusion Path and Structural Disorder in Ionic and Mixed Conductors through Diffraction Experiments Invited

    Masatomo YASHIMA

    p. 14 in Program and Abstracts of International Workshop on Structural Analyses Bridging over between Amorphous and Crystalline Materials 2008 (SABAC2008)  2008.1 

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  • (Invited Talk)Precise Structural Analysis of Advanced Ceramic Materials, Visualization of Diffusion Pathway and Chemical Bonding Invited

    Masatomo YASHIMA

    Presentation no. I-99, 2nd International Conference on Functional Materials and Devices 2008 (ICFMD-2008)  2008.6 

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  • (Invited Talk)Anisotropic Ionic Conduction of Hydroxyapatite by High-temperature Neutron Powder Diffaction Invited

    Hirotaka Fujimori, Keisuke Okanishi, Kenji Ohoyama, Masatomo YASHIMA

    The 2nd Workshop on Anisotropic Science and Technology of Materials and Devices  2008.6 

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  • (Invited Talk)Diffusion path of mobile ions and chemical bonding of some inorganic materials Invited

    Masatomo YASHIMA

    The Kumamoto International Symposium on Recent Advances of Physics and Chemistry of New Materials  2008.9 

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  • （依頼講義）放射光・中性子回折データのMPF解析 Invited

    八島正知

    日本結晶学会講習会「粉末X線解析の実際」  2011.7 

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  • （基調講演）セラミック材料の粉末回折：基礎から応用まで Invited

    八島正知

    SPring-8ガラス・セラミックス研究会（第2回）  2011.8 

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  • (Invited Talk)In situ Observation of Water in Hydroxyapatite by Neutron Diffraction Invited

    Hirotaka Fujimori, Keisuke Okanishi, Kensuke Morita, Kenji Ohoyama, Masatomo YASHIMA

    6th International Workshop on WATER DYNAMICS  2009.3 

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  • (Keynote Lecture)Precise Structure Analysis of Ceramic Materials up to 1830 K Invited

    Masatomo YASHIMA

    Joint Conference of the Asian Crystallographic Association and Chinese Crystallographic Society  2009.10 

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  • （依頼講義）リートベルト法の基礎と結晶構造・材料解析のポイント Invited

    八島正知

    情報機構講習会  2011.4 

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  • （依頼講義）RIETAN-FP利用の手引き Invited

    八島正知

    日本結晶学会講習会「粉末X線解析の実際」  2011.7 

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  • （依頼講義）リートベルト法の基礎と結晶構造・材料解析のポイント Invited

    八島正知

    情報機構 講習会  2012.4 

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  • （招待講演）セラミックスの精密構造物性 Invited

    八島正知

    ソフトプロセス研究会  2012.7 

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  • (Invited Lecture)Visualization of the Diffusional Pathway of Mobile Ions in Ionic Conducting Ceramics through Diffraction Experiments Invited

    Masatomo YASHIMA

    International Conference - School "Molecular aspects of solid state and interfacial electrochemistry (MolE)  2012.8 

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  • （依頼講義）RIETAN-FPとPRIMAの使い方とコツ Invited

    八島正知

    情報機構セミナー  2012.12 

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  • （招待講演）セラミックスの精密構造解析 Invited

    八島正知

    日本セラミックス協会秋季シンポジウム  2011.9 

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  • （依頼講演）新規カルシウムストロンチウムタングステン酸窒化物CaxSr1-xWO2Nの合成、結晶構造、光学的性質および電子構造〔結晶構造に基づいた新規光触媒の開発：循環型エネルギー源を目指して〕 Invited

    八島正知

    環境科学会2013年会  2013.9 

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  • (Invited Lecture)Design Concept of Interstitial Ion Conductors through the Higher-Valence d10 Dopant and Jahn-Teller Effect Invited

    Masatomo YASHIMA, H. Yamada, S. Nuansaeng, T. Ishihara

    The 19th International Conference on Solid State Ionics  2013.6 

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  • (Invited Lecture)Precise Structure Analysis of Ceramic Materials: Structure-Property Correlation through the Chemical Bonding and Ion-Diffusion Pathway Invited

    Masatomo YASHIMA

    Collaborative Conference on 3D & Materials Research  2013.6 

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  • （招待講演）イオン伝導性セラミックス、強誘伝体および光触媒の結晶構造と機能 Invited

    八島正知

    第3回新機能無機物質探索研究センターシンポジウム  2013.8 

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  • (Invited Lecture)Precise structure analysis of green ceramic materials up to 1850 K Invited

    Masatomo YASHIMA

    Light and Particle Beams in Materials Science (LPBMS 2013)  2013.8 

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  • （トピックス講演）酸化物イオン伝導体の新構造ファミリーの設計 (1): 結合原子価の総和（BVS）法によるLaSr2Ga11O20系酸化物イオン伝導体の発見 Invited

    八島正知, 上田孝志朗, 山田駿太郎, 尾本和樹, 藤井孝太郎

    日本セラミックス協会年会  2014.3 

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  • （トピックス講演）酸化物イオン伝導体の新構造ファミリーの設計(2): 新規構造型RBaInO4(R :希土類)酸化物イオン伝導性材料の発見 Invited

    藤井孝太郎, 江崎勇一, 齋藤千紘, 八島正知, 尾本和樹

    日本セラミックス協会年会  2014.3 

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  • (Invited Lecture)Advanced Nano Science: Ceramic Materials Science: Crystal Structure and Properties Invited

    Masatomo YASHIMA

    Seminar of the School of Materials Science and Engineering  2014.4 

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  • (Invited Talk)Precise Crystal-Structure Analysis of Ceramic Materials Invited

    Masatomo YASHIMA

    Seminar of the School of Materials Science and Engineering  2014.4 

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  • (Invited Lecture)Precise Crystal-Structure Analysis of Ion-Conducting Ceramic Materials and Oxynitride Photocatalysts by Neutron Powder Diffraction Invited

    Masatomo YASHIMA, K. Fujii

    Australia-Japan-Sharing Science with Neutrons  2013.11 

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  • （依頼講演）海外施設を利用した、クリーンエネルギーのためのセラミック材料の結晶構造の研究 Invited

    八島正知, 藤井孝太郎, 尾本和樹, 史宇飛, 兼子直人, 原武大樹, 上田孝志朗, 江崎勇一, 日比野圭佑, 山田駿太郎

    物性研究所短期研究会  2014.1 

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  • (Invited Lecture)Crystal Structure, Electronic Structure, Oxygen Diffusion, Phase Transformation, and Phase Diagram of Ceria-Zirconia and Ceria-Based Materials Invited

    Masatomo YASHIMA

    Advanced Course: Fundamentals and Applications of Cerium Dioxide in Catalysis, Summer Session of the International Center for Mechanical Sciences  2014.7 

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  • （依頼講演）X線・中性子回折によるセラミック材料の機能解明と新材料開発 Invited

    藤井孝太郎

    第4回CSJ化学フェスタ  2014.10 

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  • (Invited Lecture)Precise Structure Analysis of Ceramic Materials by Neutron Powder Diffraction Invited

    Masatomo YASHIMA, K. Fujii

    KIM-JIM symposium  2014.10 

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  • （招待講演）結晶学で切り拓く物質科学 Invited

    藤井孝太郎, 植草秀裕, 八島正知

    2014年度結晶学若手の会  2014.10 

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  • Exploration and Ion Dynamics of High Proton and Oxide-Ion Conducting Ceramics Invited

    Masatomo Yashima

    35th symposium: Ionic conduction mechanisms and dynamics at the 10th International Discussion Meeting on Relaxations in Complex Systems (10thIDMRCS)  2025 

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  • 本質的な酸素空孔を持つ高プロトン伝導体と 高酸化物イオン伝導体の発見 Invited

    八島正知

    2024 年度日本セラミックス協会 資源・環境関連材料部会講演会 「セラミックス関連技術における持続可能な社会に向けた最近の取り組み  2024.10 

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    Presentation type：Oral presentation (invited, special)  

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  • DISCOVERY of HIGH PROTON and OXIDE-ION CONDUCTORS with INTRINSIC OXYGEN VACANCIES Invited

    Breakthrough Energy Fellows Workshop Series Topic: Emerging Hydrogen Technologies  2025.1 

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    Presentation type：Oral presentation (invited, special)  

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  • 燃料電池の効率を高める新物質について －本質的な酸素空孔による高プロトン伝導体と 高酸化物イオン伝導体の発見－ Invited

    八島正知

    「時代を刷新する会」  2024 

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Industrial property rights

  • 電気伝導体、固体電解質、電解質層および電池

    八島 正知, 矢口 寛, 藤井 孝太郎, 上野 那智

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    Applicant：国立大学法人東京工業大学

    Application no：特願2022-200423  Date applied：2022.12

    Announcement no：特開2023-090680  Date announced：2023.6

    J-GLOBAL

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  • 固体電解質、電解質層、電池及び固体電解質の製造方法

    八島 正知, 村上 泰斗, 藤井 孝太郎, 城島 一暁, 森川 里穂, 安井 雄太

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    Applicant：国立大学法人東京工業大学

    Application no：特願2022-033668  Date applied：2022.3

    Announcement no：特開2022-136049  Date announced：2022.9

    J-GLOBAL

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  • 電気伝導体

    八島正知, 藤井孝太郎, 尾本和樹, 上田孝志朗, 山田駿太郎, 白岩大裕, 齋藤圭汰, 藤本絢香

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    Application no：特願2014-172914  Date applied：2014.8

    Announcement no：特開2015-171984 

    Patent/Registration no：特許第6448020号  Date issued：2018.12

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  • Perovskite Related Compound

    Masatomo YASHIMA, K. Fujii, K. Omoto, Y. Esaki, C. Saito

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    Application no：14/326,909  Date applied：2014.7

    Announcement no：US-2015-0060743-A1 

    Patent/Registration no：US Patent US9656878 B2  Date issued：2017.5

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  • ペロブスカイト関連化合物

    八島正知, 藤井孝太郎, 尾本和樹, 江崎 勇一, 齋藤 千紘

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    Application no：特願2014-008192  Date applied：2014.1

    Announcement no：特開2015-063438  Date announced：2015.4

    Patent/Registration no：特許第6384945号 

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Awards

  • 手島精一記念研究賞 研究論文賞

    2024.3   High oxide-ion conductivity through the interstitial oxygen site in Ba7Nb4MoO20-based hexagonal perovskite related oxides

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  • 令和4年度東工大教育賞 優秀賞

    2023.11  

    八島正知

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  • 日本化学会学術賞

    2018.3   日本化学会  

    八島正知

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  • 東工大教育賞 優秀賞

    2014  

    八島 正知

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  • Richard and Patricia Spriggs Phase Equilibria Award

    2010.10   The American Ceramic Society  

    Genki Kobayashi, Shin‐ichi Nishimura, Min‐Sik Park, Ryoji Kanno, Masatomo Yashima, Takashi Ida, Atsuo Yamada

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  • 日本セラミックス協会 学術賞

    2009  

    八島 正知

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  • 日本結晶学会 学術賞

    2008  

    八島 正知

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  • 触媒工業技術協会 技術賞

    2008  

    脇田崇弘, 八島正知

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  • 日本金属学会功績賞

    2008  

    八島 正知

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  • 日本セラミックス協会進歩賞

    1996  

    八島 正知

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  • 日本金属学会奨励賞

    1994  

    八島 正知

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  • 手島記念 博士論文賞

    1992  

    八島 正知

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  • AsCA 2025 Best Poster Award

    2025.12  

    Nozomi Aoki, Masatomo Yashima

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  • 日本金属学会 第3回「水素の関わる材料科学の課題共有研究会」 最優秀若手表彰(オーラルの部)

    2025.11  

    前田凌, 齊藤馨, 藤井孝太郎, 本田孝志, 八島正知

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  • The 22nd International Conference on Solid State Proton Conductors(SSPC-22) Best Poster Award

    2025.9  

    Kei Saito, Kohei Matsuzaki, Kensei Umeda, Yoichi Ikeda, Yusuke Nambu, Kazuhiro Mori, Masatomo Yashima

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  • 日本セラミックス協会第38回秋季シンポジウム 特定セッション「先進的な構造科学と分析技術」 最優秀ポスター発表賞

    2025.9  

    宇田川英寿, 兼則祐輔, 八島正知, 森一広, 池田陽一

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  • The 22nd International Conference on Solid State Proton Conductors(SSPC-22) Best Poster Award

    2025.9  

    Nozomi Aoki, Masatomo Yashima

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  • 第41回日本セラミックス協会関東支部研究発表会 特別賞

    2025.9  

    馬場光希, 齊藤馨, 梅田健成, 藤井孝太郎, 八島正知, 本田孝志

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  • 第41回日本セラミックス協会関東支部研究発表会 奨励賞

    2025.9  

    青木望, 八島正知

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  • 第41回日本セラミックス協会関東支部研究発表会 最優秀賞

    2025.9  

    前田凌, 齊藤馨, 本田孝志, 八島正知

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  • 日本セラミックス協会年会優秀ポスター発表賞 優秀賞

    2025.5  

    作田 祐一, 村上 泰斗, Avdeev Maxim, 藤井 孝太郎, 安井 雄太, Hester James R., 萩原 雅人, 池田 陽一, 南部 雄亮, 八島 正知

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  • 日本セラミックス協会年会優秀ポスター発表賞 優秀賞(黒崎播磨賞)

    2025.5  

    梅田 健成,齊藤 馨,藤井 孝太郎,森 一広,八島 正知

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  • 日本セラミックス協会年会優秀ポスター発表賞 優秀賞(品川リフラクトリーズ賞)

    2025.5  

    齊藤 馨,松崎 航平,八島 正知,池田 陽一,南部 雄亮

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  • 日本セラミックス協会年会優秀ポスター発表賞 最優秀賞

    2025.5  

    前田 凌, 齊藤 馨, 藤井 孝太郎, 八島 正知, 本田 孝志

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  • 電気化学会第92回大会 優秀学生講演賞

    2025.3  

    Bowen Yao, Jiachen Li, Yuichi Sakuda, Kotaro Fujii, Masatomo Yashima, Yusuke Nambu, Yoichi Ikeda

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  • 2024年度量子ビームサイエンスフェスタ 学生奨励賞

    2025.3  

    兼則祐輔, 齊藤馨, 作田祐一, 藤井孝太郎, 八島正知, 森一広, Maksymilian Kluczny,石原達己, Yatoo A. Mudasir, Stephen J. Skinner

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  • 公益社団法人日本金属学会 水素が関わる材料科学の課題共有研究会 優秀若手表彰（ポスターの部）

    2024.11  

    梅田健成, 齊藤馨, 森一広,藤井孝太郎, 八島正知

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  • 公益社団法人日本金属学会 水素が関わる材料科学の課題共有研究会 優秀若手表彰（ポスターの部）

    2024.11  

    前田凌, 齊藤馨, 藤井孝太郎, 本田孝志, 八島正知

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  • 日本セラミックス協会第37回秋季シンポジウム 特定セッション「先進的な構造科学と分析技術」 優秀講演賞

    2024.9  

    青木望, 矢口寛, 藤井孝太郎, 八島正知

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  • 日本セラミックス協会第37回秋季シンポジウム 特定セッション「元素・構造多様性に基づく無機化合物の物質科学」 特定セッション優秀発表賞

    2024.9  

    齊藤馨, 梅田健成, 藤井孝太郎, 森一広, 八島正知

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  • 日本セラミックス協会第37回秋季シンポジウム 特定セッション 「エネルギー変換・貯蔵・輸送セラミックス材料の基礎と応用」 最優秀プレゼンテーション賞

    2024.9  

    梅田健成, 齊藤馨, 森一広,藤井孝太郎, 八島正知

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  • 24th International Conference On Solid State Ionics (Poster Prize)

    2024.7  

    Yuichi Sakuda, Taito Murakami, Maxim Avdeev, Kotaro Fujii, Yuta Yasui, James R. Hester, Masato Hagihala, Yoichi Ikeda, Yusuke Nambu, Yatoo Mudasir A, Skinner Stephen, Masatomo Yashima

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  • 日本金属学会 2024年春期講演大会 優秀ポスター賞

    2024.3  

    青木望, 矢口寛, 藤井孝太郎, 八島正知

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  • 公益社団法人日本金属学会 水素が関わる材料科学の課題共有研究会 最優秀若手表彰(ポスターの部)

    2023.12  

    齊藤馨, 八島正知

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  • 日本セラミックス協会第36回秋季シンポジウム 特定セッション「元素・構造多様性に基づく無機化合物の物質科学」 優秀若手発表賞

    2023.9  

    上野那智,矢口寛,藤井孝太郎,八島正知,

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  • 日本セラミックス協会第36回秋季シンポジウム 特定セッション「エネルギー変換・貯蔵・輸送セラミックス材料の基礎と応用」 優秀プレゼンテーション賞

    2023.9  

    齊藤 馨, 八島 正知

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  • 第39回日本セラミックス協会関東支部研究発表会 ポスター発表賞

    2023.9  

    青木望,矢口寛,齊藤馨,松崎航平,藤井孝太郎,八島正知

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  • 日本セラミックス協会第36回秋季シンポジウム 特定セッション「先進的な構造科学と分析技術」 優秀ポスター賞

    2023.9  

    松崎 航平・張 文鋭・藤井 孝太郎・齊藤 馨・八島 正知

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  • 日本セラミックス協会2023年年会 優秀ポスター発表賞 優秀賞

    2023.3  

    安井雄太, 丹所正孝, 藤井孝太郎, 作田祐一, 後藤敦, 大木忍, 最上祐貴, 飯島隆広, 河口 彰吾, 小林慎太郎, 大坂恵一, 池田一貴, 大友季哉, 八島正知

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  • 2022年度量子ビームサイエンスフェスタ 学生奨励賞

    2023.3  

    安井 雄太, 丹所 正孝, 藤井 孝太郎, 作田 祐一, 後藤 敦, 大木 忍, 最上 祐貴, 飯島 隆広, 河口 彰吾, 小林 慎太郎, 大坂 恵一, 池田 一貴, 大友 季哉, 八島 正知

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  • 日本セラミックス協会2023年年会 優秀ポスター発表賞 優秀賞

    2023.3  

    矢口寛, 森川大輔, 齊藤高志, 津田健治, 八島正知

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  • Early career best poster award - Power of Interfaces 2022

    2022.10  

    Riho Morikawa, Taito Murakami, Kotaro Fujii, Avdeev Maxim, Masatomo Yashima

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  • 日本セラミックス協会第35回秋季シンポジウム 特定セッション「元素・構造多様性に基づく無機化合物の物質科学」 優秀発表賞

    2022.10  

    作田祐一, 藤井孝太郎, 村上泰斗, AVDEEV Maxim, HESTER James R, 萩原雅人, 八島 正知

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  • 日本セラミックス協会第35回秋季シンポジウム 特定セッション「先進的な構造科学と分析技術」 特定セッション 優秀ポスター発表賞

    2022.9  

    齊藤馨,八島正知,鳥居 周輝

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  • 第38回日本セラミックス協会 関東支部研究発表会 ポスター賞

    2022.9  

    矢口 寛, 宮澤雅大, 藤井孝太郎, 八島正知

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  • 日本セラミックス協会2022年年会優秀ポスター発表賞 優秀賞

    2022.5  

    松崎 航平・斎藤 馨・藤井 孝太郎・張 文鋭・八島 正知

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  • 2021年度量子ビームサイエンスフェスタ 学生奨励賞

    2022.3  

    城島一暁, 安井 雄太, 八島 正知

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  • 第 41 回電子材料研究討論会 奨励賞

    2022.1  

    作田祐一,村上泰斗,藤井孝太郎,八島正知,萩原雅人,Maxim Avdeev,James R. Hester

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  • 第11回CSJ化学フェスタ2021 優秀ポスター発表賞

    2021.11  

    田中真祐,藤井孝太郎,張文鋭,日比野圭佑,八島正知

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  • 日本セラミックス協会第34回秋季シンポジウム 「先進的な構造科学と分析技術」セッション 優秀講演賞

    2021.9  

    作田祐一, 藤井孝太郎, 村上泰斗, 八島正知, 萩原雅人, HESTER James. R, AVDEEV Maxim

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  • 日本セラミックス協会第34回秋季シンポジウム「エネルギー変換・貯蔵・輸送セラミックス材料の基礎と応用」セッション 最優秀プレゼンテーション賞

    2021.9  

    城島一暁,安井雄太,藤井孝太郎,村上泰斗,張文鋭,八島正知

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  • 第37回日本セラミックス協会関東支部研究発表会 ポスター賞

    2021.9  

    森川里穂,藤井孝太郎,張文鋭,八島正知

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  • 日本セラミックス協会2021年年会 優秀ポスター発表賞 優秀賞

    2021.3  

    田中真祐, 藤井孝太郎, 村上泰斗, 日比野圭佑, 八島正知

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  • 日本セラミックス協会2021年年会 優秀ポスター発表賞 優秀賞

    2021.3  

    神田橋治恵, 張文鋭, 村上泰斗, 藤井孝太郎, 八島正知, 稲熊宜之

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  • 日本セラミックス協会 第36回関東支部研究発表会 優秀賞

    2020.9  

    作田祐一,藤井孝太郎,村上泰斗,八島正知,James R. Hester

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  • 日本セラミックス協会第33回秋季シンポジウム 先進的な構造科学と分析技術 特定セッション 優秀講演賞

    2020.9  

    安井雄太, 八島正知, 藤井孝太郎, 村上泰斗, 辻口峰史, James R. Hester, 木本浩司, 柳澤圭一

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  • 日本セラミックス協会 第36回関東支部研究発表会 優秀賞

    2020.9  

    作田祐一, 藤井孝太郎, 村上泰斗, 八島正知, Hester James R

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  • 日本セラミックス協会第33回秋季シンポジウム 先進的な構造科学と分析技術 特定セッション 優秀講演賞

    2020.9  

    張文鋭,藤井孝太郎,萩原雅人,神山崇,八島正知

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  • 日本セラミックス協会第33回秋季シンポジウム 先進的な構造科学と分析技術 特定セッション 優秀講演賞

    2020.9  

    志賀仁美,藤井孝太郎,村上泰斗,白岩大裕,矢口寛,神山崇,八島正知

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  • 日本セラミックス協会 第36回関東支部研究発表会 最優秀賞

    2020.9  

    菊地優冴, 藤井孝太郎, 村上泰斗, 八島正知

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  • 日本セラミックス協会第33回秋季シンポジウム 先進的な構造科学と分析技術 特定セッション Webテキスト発表賞

    2020.9  

    田中真祐,藤井孝太郎,村上泰斗,日比野圭佑,八島正知

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  • 日本セラミックス協会2020年年会 優秀ポスター発表賞 優秀賞

    2020.3  

    作田祐一,辻口峰史,藤井孝太郎,村上泰斗,八島正知,鳥居周輝,神山 崇,James R. Hester

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  • 日本セラミックス協会2020年年会 優秀ポスター発表賞 最優秀賞

    2020.3  

    神田橋治恵, 張文鋭, 村上泰斗, 藤井孝太郎, 八島正知

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  • 新学術領域研究「複合アニオン化合物の創製と新機能」2020年１月若手スクール 優秀ポスター賞

    2020.1  

    田中真祐, 藤井孝太郎, 村上泰斗, 八島正知

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  • The 13th Pacific Rim Conference of Ceramic Societies(PACRIM13) Best Poster Award

    2019.10  

    Yuichi Sakuda, Takafumi Tsujiguchi, Kotaro Fujii, Eiki Niwa, Taito Murakami, Shunta Nishioka, James R. Hester, Kazuhiko Maeda, Masatomo Yashima

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  • The 13th Pacific Rim Conference of Ceramic Societies(PACRIM13) Best Presentation Award

    2019.10  

    Taito Murakami, Takafumi Tsujiguchi, Yuichi Sakuda, Yuta Yasui, Ping Miao, Masato Hagihara, Shuki Torii, Takashi Kamiyama, Kotaro Fujii, Masatomo Yashima

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  • The 13th Pacific Rim Conference of Ceramic Societies(PACRIM13) Poster Award

    2019.10  

    Yuta Yasui, Eiki Niwa, Masahiro Matsui, Kotaro Fujii, Masatomo Yashima

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  • 新学術領域研究「複合アニオン化合物の創製と新機能」第5回若手の会 優秀ポスター賞

    2019.5  

    張文鋭, 藤井孝太郎, 村上泰斗, 八島正知

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  • The 13th Pacific Rim Conference of Ceramic Societies(PACRIM13) Poster Award

    2019.5  

    Hiroaki Tejima, Kotaro Fujii, Eiki Niwa, Taito Murakami, Masatomo Yashima

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  • 日本セラミックス協会2019年年会 優秀ポスター発表賞（優秀賞）

    2019.3  

    張文鋭,藤井孝太郎,丹羽栄貴,八島正知,神山崇,鳥居周輝,萩原雅人

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  • 日本セラミックス協会2019年年会 優秀ポスター発表賞（優秀賞）

    2019.3  

    手島広明,藤井孝太郎,丹羽栄貴,八島正知

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  • 新学術領域研究 「複合アニオン化合物の創製と新機能」若手スクール 優秀ポスター発表賞

    2019.1  

    矢口寛, 藤井孝太郎, 丹羽栄貴, 白岩大裕, 日比野圭佑, 荻野拓, 辻本吉廣, 八島正知

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  • 新学術領域 研究「複合アニオン化合物の創製と新機能」若手スクール 優秀ポスター発表賞

    2019.1  

    安井雄太, 丹羽栄貴, 松井将洋, 藤井孝太郎, 八島正知

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  • 第8回 CSJ化学フェスタ2018 優秀ポスター発表賞

    2018.11  

    矢口寛,藤井孝太郎,丹羽栄貴,白岩大裕,日比野圭佑,八島正知

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  • 第8回 CSJ化学フェスタ2018 優秀ポスター発表賞

    2018.11  

    井上遼太, 白岩大裕, 藤井孝太郎, 丹羽栄貴, 八島正知, 北川裕貴, 淺見一喜, 上田純平, 田部勢津久

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  • 日本結晶学会 2018年度年会 ポスター賞

    2018.11  

    辻口峰史, 藤井孝太郎, 齋藤圭汰, 丹羽栄貴, James R. Hester, 鳥居周輝, 神山 崇, 八島正知

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  • 日本セラミックス協会 第31回秋季シンポジウム先進的な構造科学と分析技術セッション 優秀講演賞

    2018.9  

    安井雄太, 松井将洋, 藤井孝太郎, 丹羽栄貴, 八島正知

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  • 日本セラミックス協会 第31回秋季シンポジウム先進的な構造科学と分析技術セッション 優秀ポスター賞

    2018.9  

    松井将洋, 藤井孝太郎, 丹羽栄貴, 八島正知

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  • 日本セラミックス協会2018年年会 優秀ポスター発表賞（優秀賞）

    2018.5  

    矢口 寛, 藤井孝太郎, 丹羽栄貴, 白岩大裕, 日比野圭佑, 八島正知

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  • 2018年年会 優秀ポスター発表賞（優秀賞）

    2018.5   日本セラミックス協会  

    城戸 誉芳, 白岩大祐, 藤井孝太郎, 丹羽栄貴, 八島正知

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  • 第34回希土類討論会学生講演賞

    2018.5  

    安永拓矢, 加藤英樹, 小林亮, 藤井孝太郎, 八島正知, 垣花眞人

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  • 日本セラミックス協会2018年年会優秀ポスター発表賞（優秀賞）

    2018.5  

    辻口 峰史、藤井孝太郎、丹羽栄貴、齋藤圭汰、八島正知、James R. Hester

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  • 日本セラミックス協会2018年年会 優秀ポスター発表賞（優秀賞）

    2018.5  

    海野 航、藤井孝太郎、丹羽栄貴、八島正知、鳥居周輝、Miao Ping、神山崇

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  • 日本セラミックス協会2018年年会優秀ポスター発表賞（最優秀賞）

    2018.5  

    安永拓矢, 加藤英樹, 小林亮, 藤井孝太郎, 八島正知, 垣花眞人

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  • 東京工業大学エネルギーコース合同発表会Outstading Presentation Award

    2018.1  

    松井 将洋, 藤井 孝太郎, 丹羽 栄貴, 八島正知

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  • 平成29年度 日本結晶学会年会 ポスター賞

    2017.11  

    日比野圭佑, 小堺理史, 丹羽栄貴, 藤井孝太郎, 石原達己, James R. Hester, 八島正知

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  • 合金状態図第172委員会 第33回研究会 Best Poster Award

    2017.10  

    丹羽栄貴, 神庭伸吾, 藤井孝太郎, 橋本拓也, 八島正知

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  • 第37回エレクトロセラミックス研究討論会 研究奨励賞

    2017.10  

    海野航, 藤井孝太郎, 丹羽栄貴, 八島正知

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  • 第37回エレクトロセラミックス研究討論会 優秀賞

    2017.10  

    中村圭吾, 藤井孝太郎, 丹羽栄貴, 八島正知

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  • 日本セラミックス協会第30回秋季シンポジウム 先進的な構造科学と分析技術セッション 優秀ポスター賞

    2017.9  

    白岩大裕, 森瀬貴彦, 藤井孝太郎, 丹羽栄貴, 八島正知

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  • 新学術領域「複合アニオン化合物の創製と新機能」仙台ミーティング 最優秀ポスター賞

    2017.8  

    白岩大裕, 藤井孝太郎, 荻野拓, 辻本吉廣, 丹羽栄貴, 八島正知

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  • 日本セラミックス協会第29回秋季シンポジウム 先進的な構造科学と分析技術セッション 最優秀賞講演賞

    2016.9  

    中村圭吾, 藤井孝太郎, 丹羽栄貴, 八島正知

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  • 東京工業大学理学部化学科 卒業研究 優秀ポスター賞

    2016.3  

    中村圭吾, 藤井孝太郎, 丹羽栄貴, 八島正知

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  • 日本セラミックス協会2015年秋季シンポジウム「先進的な構造科学と新物質開拓」セッション 優秀ポスター発表賞

    2015.9  

    白岩大裕, 藤井孝太郎, 江崎勇一, 八島正知

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  • 第3回物構研サイエンスフェスタ 学生奨励賞

    2015.3  

    白岩大裕, 江崎勇一, 藤井孝太郎, 八島正知

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  • 日本セラミックス協会 優秀ポスター発表賞（優秀賞）

    2015.3  

    藤井孝太郎, 白岩大裕, 江崎勇一, 八島正知

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  • 日本結晶学会 ポスター賞

    2014.11  

    日比野圭佑, 島田和歩, 藤井孝太郎, 大島崇義, 前田和彦, 石谷治, 八島正知

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  • 日本セラミックス協会 優秀ポスター発表賞（優秀賞）

    2014  

    上田孝志朗, 尾本和樹, 藤井孝太郎, 八島正知, Su Jae Kim, Seongsu Lee

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  • 日本結晶学会 ポスター賞

    2012  

    尾本和樹, 八島正知

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  • 日本セラミックス協会 ポスター賞

    2012  

    尾本和樹, 八島正知

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  • Poster Award

    2011.11   1st Asia-Oceania Conference on Neutron Scattering (AOCNS)  

    Y.-C. Chen, U. Fumi, M. Yashima, T. Ohta, S. Yamamoto, K. Ohoyama

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  • Best Poster Award

    2010.11   ICC3  

    Y.-C. Chen, M. Yashima, T. Ohta, S. Yamamoto, T. Takizawa, K. Ohoyama

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  • ポスター賞

    2010.11   日本結晶学会  

    齊藤未央,八島正知 他

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  • 第16回（2004年春季）応用物理学会講演奨励賞

    2004  

    保科拓也, 掛本博文, 和田智志, 鶴見敬章, 八島正知, 加藤健一

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  • 田中貴金属MMS賞

    1999  

    八島 正知

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  • ETH-TITech Award

    1993  

    八島 正知

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▼display all

Research Projects

  • Creation of High Ion Conductors within the Norby Gap

    Grant number：24H00041  2024.4 - 2029.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

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    Grant amount：\201240000 （ Direct Cost: \154800000 、 Indirect Cost：\46440000 ）

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  • Exploration of New-Type Proton Conductors via Intrinsic Oxygen Vacancy Layers

    Grant number：21K18182  2021.7 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Pioneering)

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    Grant amount：\26000000 （ Direct Cost: \20000000 、 Indirect Cost：\6000000 ）

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  • New Ionic Conductors Designed by a Variety of Coordination Polyhedra

    Grant number：20K20293  2020.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Pioneering)

    Yashima Masatomo

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    Grant amount：\25740000 （ Direct Cost: \19800000 、 Indirect Cost：\5940000 ）

    In this project, we have explored new ionic conductors with the crystal structure containing unusual coordination polyhedra. We discovered numerous new ionic conductors such as Ba1+xNd1－xInO4－x/2, BaHo2ZnO5, Ca3Ga4O9, BaGdInO4-based materials, Ba7Nb3.9Mo1.1O20.05. Ba7Nb3.9Mo1.1O20.05 shows a wide stability range and predominantly oxide-ion conduction in the oxygen partial pressures. The bulk conductivity of Ba7Nb3.9Mo1.1O20.05 is extremely high at 309 oC, which is higher than those of bismuth oxide-based materials and conventional YSZ. This high conductivity of Ba7Nb3.9Mo1.1O20.05 is attributable to the interstitial O5 oxygen, two-dimensional oxide-ion O1－O5 interstitialcy diffusion through the lattice tetrahedral O1 and interstitial O5 octahedral oxygen sites in the oxygen-deficient layer on the ab plane (z = 0) and the low activation energy for oxide-ion conductivity.

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  • 新構造型イオン伝導体の創製と構造物性

    Grant number：19H00821  2019.4 - 2023.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)

    八島 正知, 高垣 敦

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    Grant amount：\45240000 （ Direct Cost: \34800000 、 Indirect Cost：\10440000 ）

    本課題では，過去に検討がなされていない数多くの物質群について，構造マップ，結晶構造データベース、結合原子価法などを駆使して新しい結晶構造を持つイオン伝導体の候補ならびに新しいタイプのイオン伝導体の候補を探索した．有望な候補物質を合成，酸化物イオン伝導などの物性と結晶構造を実験で調べ，優れた特性を示す新構造ファミリーを探索し、物性発現機構を研究した。2021年度の主な研究実績は、①高い酸化物イオン伝導度を示す新しい六方ペロブスカイト関連酸化物を発見したこと（Small誌に出版、プレスリリース、新聞発表）、②従来より伝導度が高い新しいDion-Jacobson化合物を発見したこと(Ceram. Int.誌に出版)、③酸塩化物では初めてとなる酸化物イオン伝導体を発見したこと（ACS Appl. Energy Mater. 誌に出版）、④酸化物イオン伝導体である六方ペロブスカイト関連酸化物の酸化物イオン伝導性と結晶構造の関係を解明したこと（J. Phys. Chem. C誌に出版）である。特に、①では(1)新しい母物質の固溶体を発見して、関連物質よりも高い酸化物イオン伝導度を示すことがわかったこと、(2)従来未解明であったMo/Nb規則・不規則性を、新しい母物質の固溶体でTa/Nb規則性を見出したことは価値が高い。②ではSr/Bi置換により従来のDion-Jacobson相の伝導度を2倍向上させることに成功した。③の酸塩化物に関する研究では、酸化物イオンに比べてサイズが大きな塩化物イオンを利用すれば、格子体積と自由体積が大きな化合物を安定化できるというユニークな発想により、酸塩化物という新しいタイプの酸化物イオン伝導体の発見に至った。④では、中性子散乱長密度分布というユニークな手法により、物質による伝導度の活性化エネルギーの違いを解明した。

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  • 複合アニオン化合物の創製と新機能に関する研究の国際活動支援

    Grant number：16K21724  2016.6 - 2023.3

    日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

    陰山 洋, 前田 和彦, 荻野 拓, 林 克郎, 八島 正知

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    Grant amount：\43940000 （ Direct Cost: \33800000 、 Indirect Cost：\10140000 ）

    国際活動支援班の「国際共同研究推進委員会」「相互派遣企画委員会」「海外施設派遣支援検討委員会」「レクチャーツアー企画委員会」において，2016～2019年度に各項目を具体的に検討・実行した。各班の代表が，各班の国際共同研究，海外の大型施設利用，国際ネットワーク，支援すべき若手の状況と支援要望を集め国際活動支援班に集約した。上記４つの支援検討委員会の委員で検討し，海外ハブ研究者の助言や協力を仰ぎながら，計画・公募班の関連メンバーが国際共同研究を推進できるように積極的に支援した。計画班員の組織の若手を海外機関に派遣し，国際共同研究の推進すると共に，国際性のある若手を育成してきた。特に，海外大型実験施設への派遣や複数機関への滞在により継続的・発展的なネットワークを構築した。例えば，中性子回折装置を用いて複合アニオン化合物の結晶構造を研究するために，オーストラリア国立原子力科学技術機構へ日本人の若手研究者と優秀な大学院生を派遣した。国外の若手を計画・公募班の研究室へ派遣し，国際共同研究の推進や日本人海外研究者の帰国支援に活かすと共に，複数機関の滞在によるキャリアパス支援を図った。また計画研究メンバーによるレクチャーツアーを行い，本領域の積極的な情報発信をするとともに，「複合アニオン化合物」の国際的認知度を高めるとともに国際共同研究を積極的に働きかけた。2020年度はコロナ禍のため国内の研究者の海外への派遣，国外の研究者の日本への招聘，レクチャーツアーを行うことができなかったため，研究課題の繰越手続きを経て2021年度を迎えることとした。当該年度もコロナ禍の影響を大きく受ける形となったが，様々な方面に働きかけることで博士研究員1名（韓国）と大学院生1名（タイ）を受け入れ，国際共同研究を実施することができた。これらの成果については，学術論文1報をすでに投稿し，さらに2報を準備中である。

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  • Summary of Synthesis of Mixed Anion Compounds toward Novel Functionalities

    Grant number：16H06438  2016.6 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Kageyama Hiroshi

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    Grant amount：\182130000 （ Direct Cost: \140100000 、 Indirect Cost：\42030000 ）

    Under our leadership with the advice of the evaluation committee, all the members gathered their strengths and managed the project in a functional and dynamic manner. Collaboration has been accelerated and strengthened with the addition of new members who are capable of carrying out new collaborations, and collaborative research covering a wider range of fields has become possible. The website introduced not only research results but also outreach activities, and the human resources database and research database were also put into full-scale operation. Under the collaboration with the overseas activities support group, mutual exchanges with overseas researchers, use of large overseas facilities, international conferences, and an online seminar series after the covid were held. In addition, the group led research both domestically and internationally through a review paper (Nat Commun 2018) andt textbook on mixed-anion compounds (2021), and the planning of various symposia.

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  • Understanding of Mixed Anion Compounds: Analyses of Chemical, Structural and Electronic States

    Grant number：16H06440  2016.6 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Hayashi Katsuro

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    Grant amount：\275080000 （ Direct Cost: \211600000 、 Indirect Cost：\63480000 ）

    For the evaluation of “mixed anion compounds”, the conventional research style has not been applicable and the evaluation and analysis methods had not been established at all. To overcome this, leading researchers about advanced material evaluation have collaborated with each other as well as with research groups of the synthesis and the materials functions. Regarding issues on the evaluation and characteristics of mixed anion compounds, the first half of the project focused on the methodology of light-element anion identification and relevant structural analysis, the clarification of the specificity of hydride (H-) ions, and the clarification of coordination polyhedral geometry through joint experimental and theoretical researches. After that, we focused on the dynamics of mixed anion systems, expanded to the analysis and understanding of materials systems and processes beyond crystals, and finally elaborated on the exploration and theoretical analysis of new ionic conductors.

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  • Creation of Novel High Performance Catalyst Tailored by Chemo-mechanical Effects

    Grant number：16H06293  2016.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Specially Promoted Research

    Ishihara Tatsumi

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    Grant amount：\494910000 （ Direct Cost: \380700000 、 Indirect Cost：\114210000 ）

    In spite of strong influence of chemomechanical strain on property of materials reported, systematic study is not enough, in particular, in field of catalyst and surface property. In this study, application of the materials showing increased oxide ion conductivity by chemomechanical strain effects to activation of oxygen for fuel cells or environmental catalyst was studied. Effects of chemomechanical strain on cathode of fuel cells, NO direct decomposition, low temperature oxidation, and photocatalyst were investigated from surface composition and surface property change and it was found that catalytic activity in these areas can be much increased by introduction of chemomechanical tensile strain. From low energy ion scattering measurement which is sensitive outermost layer of the materials, the much increased catalytic property was explained by the change of surface composition or formation of oxygen vacancy by stabilizing the unusual valence number cation on the surface.

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  • Exploration of the New Structure Families Exhibiting Ion Conduction through Bond-Valence-based Energy

    Grant number：15H02291  2015.4 - 2019.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Yashima Masatomo, Fujii Kotaro, Niwa Eiki

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    Grant amount：\44070000 （ Direct Cost: \33900000 、 Indirect Cost：\10170000 ）

    To explore new structural-type ion conductors, we have screened several hundred compounds. Single-phase samples of 84 compositions of candidate materials and their solid solutions were synthesized. We investigated their structural and electrical properties. In this project, we discovered 28 new structural-type ion conductors. LaSr2Ga11O20 was found to be a new structural-type ion conductor and a patent was obtained. We also discovered new structural-type oxide-ion conductors Ca0.8Y2.4Sn0.8O6 and SrYbInO4. New structural-type oxide-ion conductors exhibiting electrical conductivities higher than those of YSZ were also discovered in this project. We have experimentally visualized the oxide-ion diffusion pathways of pyrochlore-type oxides for the first time by high-temperature neutron diffraction and maximum-entropy method. Surprisingly, we have also found no interstitial oxygen atoms in the apatite-type oxide-ion conductors by the single-crystal neutron and X-ray diffraction analyses.

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  • Correlation between the precise crystal/electronic structure and properties of metal oxynitride photocatalysts: Can we predict the band gap from the structures?

    Grant number：25630365  2013.4 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    YASHIMA Masatomo

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    Grant amount：\4030000 （ Direct Cost: \3100000 、 Indirect Cost：\930000 ）

    In this project, we have investigated the crystal structure, electron-density distribution, electronic structure and optical properties of metal oxynitrides. We prepared the perovskite-type oxynitrides by heating of metal oxides under ammonia flowing. Synchrotron X-ray powder diffraction data of metal oxynitrides were analyzed by Rietveld and maximum-entropy methods.

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  • Creation of Novel Fast Oxide Ion Conductor Based On Nano Structure Control of Interface and Application for Fuel Cells

    Grant number：24226016  2012.5 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    ISHIHARA Tatsumi

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    Grant amount：\201110000 （ Direct Cost: \154700000 、 Indirect Cost：\46410000 ）

    There are strong interests on increased oxide ion conductivity at interface between different lattice parameter. In this study, increased oxide ion conductivity at interface between two mixed ion conductor were investigated. It was found that oxide ion conductivity of doped Pr2NiO4/CeO2 laminated nano thickness film was much increased by starin effects. In addition, oxygen dissociation activiity was also much increased on double colamunar film. Tensile stress caused by Au dispersion is also effective for increasing oxide ion conductivity in Pr2NiO4 based oxide. This study revealed that tensile strain shows large positive effects on oxide ion conductivity as well as surface activitiy.

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  • Structure design of ion conducting d10 metal oxides

    Grant number：24246107  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    YASHIMA Masatomo, ISHIHARA Tatsumi, FUJII Kotaro

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    Grant amount：\42250000 （ Direct Cost: \32500000 、 Indirect Cost：\9750000 ）

    Summary of our research project entitled, "Structure design of ion conducting d10 metal oxides", is described here. The role of d10 Ga in Pr2(Ni,Cu,Ga)O4 oxide-ion conducting material was investigated. We found that the interstitial oxygen amounts (carrier concentration) are increased by doping the higher valence of Ga3+ compared with Ni2.5+. We have explored new structure family of oxide-ion conducting materials with AA'BO4 compositions and we discovered a new structure family NdBaInO4. Sr doping into NdBaInO4 improved oxide-ion conductivity. Oxide-ion diffusion pathway was visualized for Pr2(Ni,Cu,Ga)O4, PrBaCo2O5.5+delta and Ce0.5Zr0.5O2. In Pr2(Ni,Cu,Ga)O4 and PrBaCo2O5.5+delta, two-dimensional diffusion pathway was observed. The thermal expansion anisotropy of K2NiF4-type A2BO4 oxides was also investigated at an atomic scale. The anisotropic thermal expansion is attributable to anisotropic B-O bonding, from view points of interatomic distance, electron density and bond valence.

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  • Can we determine the activation energy for ionic conduction from the nuclear- and electron-density distributions?

    Grant number：23655190  2011 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    YASHIMA Masatomo

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    Grant amount：\4160000 （ Direct Cost: \3200000 、 Indirect Cost：\960000 ）

    In this project, we have investigated the crystal structure, nuclear-density distribution, electronic structure and oxygen permeation rate of two K_2NiF_4-type oxides of Pr_2(Ni_0.75Cu_0.25)_0.95Ga_0.05O_4+δ and Pr_2Ni_0.75Cu_0.25_O4+δ. Nuclear-density distributions of Pr_2(Ni_0.75Cu_0.25)_0.95Ga_0.05O_4+δ and Pr_2Ni_0.75 Cu_0.25_O4+δ at high temperatures have visualized the -(apical oxygen O2)- (interstitial oxygen O3)-(apical oxygen O2)- diffusional pathway of oxide ions, which indicates an interstitialcy diffusion mechanism. It was found that the minimum nuclear density on the O2-O3 pathway ρN(T) is a useful microscopic parameter for the oxygen diffusivity. The ρN(T) is regarded as the oxygen probability density at the bottleneck for diffusion. The oxygen permeation rate ρp (T) increases with an increase of ρN (T). The activation energy for oxygen diffusion estimated by the plots of log(the normalized oxygen permeation rate ρP (T)/δ ) against T^-1 (reciprocal of absolute temperature) is independent of temperature, as well as the formation energy of oxygen atoms at the bottleneck from the plots of log(ρN(T)/ δ ) against T^-1. These results indicate that the amount of interstitial oxygen δ is proportional to the carrier concentration for the oxide-ion diffusion.

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  • Origin of the Large Oxygen Permeability in Praseodymium Nickel Oxides

    Grant number：21360318  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    YASHIMA Masatomo, ISHIHARA Tatsumi

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    Grant amount：\17940000 （ Direct Cost: \13800000 、 Indirect Cost：\4140000 ）

    Origin of the large oxygen permeability in the doped praseodymium nickel oxide(Pr_<0. 9> La_<0. 1>)_2(Ni_<0. 74> Cu_<0. 21> Ga_<0. 05>) O_<4+δ> has been investigated at atomic and electronic levels. Using the high-temperature neutron diffractometry, we found that the oxide ions in(Pr_<0. 9> La_<0. 1>)_2(Ni_<0. 74> Cu_<0. 21> Ga_<0. 05>) O_<4+δ> diffuse two dimensionally through the interstitial site, which is responsible for the high oxide-ion diffusivity.

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  • Peculiar electrode activity in localized electron system

    Grant number：19205027  2007 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    YAMADA Atsuo, NISHIMURA Shinichi, SHIRO Seki, YASHIMA Masatomo, KANNO Ryoji

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    Grant amount：\50830000 （ Direct Cost: \39100000 、 Indirect Cost：\11730000 ）

    We have focused on the electrode function of insulating materials which had been believed inactive. Some compounds with high activity were discovered during the project, of which structure was also determined. Atomic-scale anisotropic lithium diffusion and subsequent clustering, together with their kinetics, were experimentally elucidated. Thermodynamic approach was made to understand the size-dependency of these phenomena.

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  • イオン伝導経路はどこまで可視化できるか?

    Grant number：17656211  2005 - 2006

    日本学術振興会  科学研究費助成事業  萌芽研究

    八島 正知

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    Grant amount：\3400000 （ Direct Cost: \3400000 ）

    エネルギーや環境分野ではイオン伝導体と混合伝導体が重要な材料であり、固体におけるイオンの移動現象が現代科学技術の中心的な課題の一つになっている。高温中性子回折法により、Ce_<0.93>Y_<0.07>O_<1.96>の核密度分布を調べた。室温では酸化物イオン(O^<2->)は螢石型構造の正規の位置(Fm3mの8c席)の近くに局在化している。一方、高温1434℃では酸化物イオンは大きく広がって、酸化物イオンの分布が隣の席の分布と連結している。酸化物イオンは陽イオンに比べて大きく広がり、隣の席と連結している。<100>方向に沿った拡散経路が観察された。また、<110>方向に沿った拡散経路も可能である。<110>方向に沿った拡散経路では、まず酸化物イオンが<111>方向に沿って変位してから、<100>方向に移動する。このような<111>方向への変位は、Bi_2O_3,Bi_<1.4>Yb_<0.6>O_3,CeO_2のような螢石型構造を有するイオン伝導体において見られる。一方、イオン伝導度が低い添加物を入れていない純CeO_2では拡散経路に対応する連結した密度分布は見られなかった。また、<100>に沿った拡散経路は螢石型酸化物イオン伝導体Bi_<1.4>Yb_<0.6>O_3と陽イオン(Cu^+)伝導体CuIでも観察された。したがって、イオンの拡散経路は、結晶構造に強く依存しており、同じ螢右型構造でかつ可動イオンの安定位置が8c席であれば、陽イオンや可動イオンの種類に依らず、同じ<111>方向への変位と<100>方向への拡散を示すと考えられる。

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  • Ionic conduction path, covalent bonding and phase transition of lithium-ion conductors

    Grant number：17360319  2005 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    YASHIMA Masatomo, SASAKI Satoshi, ITOH Mitsuru, KAMIYAMA Takashi, TANAKA Masahiko

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    Grant amount：\15500000 （ Direct Cost: \15500000 ）

    We have reported the results of a neutron powder diffraction study of La_<0.62>Li_<0.16>TiO_3 perovskite that determines the diffusion path of lithium cations at room temperature. At 77K, the Li cations are located at the 2c site on the (002) La deficient layer, while at room temperature, they spread over a wide area and migrate following the 2c-4f-2c or 2c-2d-2c tie line. We have demonstrated that the probability density of Li cations has a minimum between the 2c and 4f or between the 2c and 2d positions on the diffusion path, in contrast to the previous reports where the bottleneck has been thought to be located at the 2c, 2d and 4f positions. Since most of the Li cations are not located at the 4j A-site but at the 2c site, the chemical formula of the title compound is not (La_<2/3-x>, Li_<3x>, (Va_<(A-site)>)_<1/3-2x>)_<A-site>TiO_3, but (La_<2/3-x>,(Va_<(A-site)>)_<1/3+x>)_<A-site>(Li_<3x>,(Va_<(2c)>)_<1/4-3x>)_<2c>TiO_3. The present conclusion would be helpful when discussing the conduction mechanism of Li-ion conductors.
    A size effect on crystal structure has been investigated for barium titanate (BaTiO_3) nanoparticles of 40-, 140- and 430-run sizes, by means of neutron and high-resolution synchrotron X-ray powder diffraction and Raman scattering techniques. Temperature dependence of lattice parameters of bismuth sesquioxide (Bi_2O_3) has been obtained between 26°and 778℃ by the Rietveld method using neutron powder diffraction data. A new electric furnace has been designed and fabricated for measurements of the high-resolution synchrotron radiation powder diffraction profiles from materials at high temperatures up to 1807 K in air, suitable for the multiple-detector system installed at the BL-4B_2 experimental station of the Photon Factory in Tsukuba, Japan. Crystal structure of copper iodide (CuI) has been studied at 300 K and 760 K using synchrotron X-ray powder diffraction data. Tantalum oxynitride (TaON) is investigated by neutron and synchrotron diffraction analysis to clarify the structural and electronic features responsible for the visible-light activity of this material.

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  • Precise Structure Analyses of Perovskite-type Mixed Conductors

    Grant number：17350011  2005 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    NOMURA Katsuhiro, KAGEYAMA Hiroyuki, YASHIMA Masatomo, KAKINUMA Katsuyoshi

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    Grant amount：\15300000 （ Direct Cost: \15300000 ）

    In this study, we aimed at 1) developing a neutron diffractometry under fuel cell operating conditions and a crystal structure evaluation method at a nuclear density level, and 2) elucidating the relationship between the crystal structure at a nuclear (or an electron) density level and the electrical conduction properties of perovskite-type mixed conductors. In fiscal 2005, (La,Sr)MnO_3-based perovskite-type compounds were synthesized and the following measurements were carried out: an X-ray absorption fine structure (XAFS) measurement (at National Institute of Advanced Industrial Science and Technology (AIST)), an X-ray diffraction measurement (at AIST), a high-temperature neutron diffraction measurement (at Tokai R&D center, Japan Atomic Energy Agency (JAEA)). In addition, a sample heating apparatus for high temperature neutron diffraction measurements has been designed and fabricated, and then a test run was carried out. In fiscal 2006, (La,Sr)CoO_3-based perovskite-type compounds were synthesized and the following measurements were carried out: in-situ synchrotron XAFS measurement (at Spring-8), in-situ X-ray diffraction measurement (at AIST), and in-situ neutron diffraction measurement using the heating apparatus developed in this project (at Tokai R&D center, JAEA). On the basis of analysis results of the measured data, we found close relationships between the crystal structures at nuclear (or electron) density level and the electrical conduction properties (oxide-ion and hole conductivities) of perovskite-type mixed conductors.
    In the future, we are planning to conduct in-situ neutron diffraction measurements using the new sample heating apparatus developed in this project for different kinds of fuel cell related materials. For the diffraction data obtained, we will make structure analyses at a nuclear density level, and elucidate its relationships with electrical conductivity systematically. We are also planning to open the research results on the WEB site "Solid-State Conductors Database for Electrochemical Devices (SSCED)" (URL http: //riodbdev.ibase.aist.go.jp/ssced/en/index.html) of the research information database (RIO-DB), AIST.

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  • Visualization Method of Ionic Conductivity

    Grant number：15350125  2003 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KAMIYAMA Takashi, IKEDA Susumu, YASHIMA Masatomo

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    Grant amount：\15200000 （ Direct Cost: \15200000 ）

    High temperature structural determination of inorganic materials is more and more important in both basic science and application point of view. High resolution neutron powder diffraction is a powerful tool in such studies. We have been developing high resolution Time-of-Flight (TOF) neutron powder diffractometers (NPD) at the pulsed neutron facility KENS. With using high resolution TOF-NPD, high quality crystallographic data are obtained. We have succeeded in high temperature in situ measurement using TOF-NPD. In addition, Maximum Entropy Method (MEM) is successfully applied to TOF-NPD data (TOF/MEM), and average distribution of ions are visualized by MEM. In addition to average structures, local structures of mobile ions in ionic conductors are also important to understand the mechanism of the ionic conductivity. We have obtained the pair distribution function (PDF) and radial distribution function (RDF) from the structure factor S(Q) obtained from TOF neutron diffraction data.

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  • Temperature dependence of the electron-density and nuclear-density distributions in materials for solid oxide fuel cells

    Grant number：15360340  2003 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    YASHIMA Masatomo, IZUMI Fujio, SASAKI Satoshi, KAMIYAMA Takeshi, TANAKA Masahiko

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    Grant amount：\13400000 （ Direct Cost: \13400000 ）

    We have investigated the positional disorder and diffusion path of oxide ions in Bi_2O_3,CeO_2, and (La_<0.8>Sr_<0.2>)(Ga_<0.8>Mg_<0.15>Co_<0.05>)O_<3-δ・>. These were studied through the nuclear density distribution obtained by a combined technique including a Rietveld refinement, a maximum-entropy method(MEM) and MEM-based pattern fitting of the neutron powder diffraction data measured at high temperatures. Oxide ions in fluorite-type structured δ-Bi_2O_3 and CeO_2 have a complicated disorder spreading over a wide area and shift to the <111> directions from the ideal fluorite site at higher temperatures. Diffusion path of oxide ions in (La_<0.8>Sr_<0.2>)(Ga_<0.8>Mg_<0.05>Co_<0.05>)O_<3-δ> perovskite is not along the straight line between the ideal positions, but exhibits an arc shape away from the B-site cation (Ga_<0.8>Mg_<0.5>Co_<0.05>).

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  • In situ observation of phase transition in perovskite compounds by high-resolution synchrotron radiation powder diffractometry

    Grant number：13450267  2001 - 2002

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    YASHIMA Masatomo, TANAKA Masahiko, SASAKI Satoshi

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    Grant amount：\14900000 （ Direct Cost: \14900000 ）

    La_<2/3>TiO_3-based provskite-stractured compounds are attractive materials for both wireless technologies and SOFC (Solid Oxide Fuel Cells) utilizing their excellent electrical properties. The electrical properties are strongly dependent on crystal structure of the perovskite solid solutions. The present letter reports the orthorhombic-tetragonal phase transition, remarking the precise unit-cell parameters that have not been determined in the literature, due to the lower angular resolution of the conventional laboratory-based diffractometer. This letter also demonstrates that the high-resolution synchrotron diffraction technique is very powerful to study the temperature dependence of the unit-cell parameters even near the transition point. This is worth publishing, because most of previous synchrotron diffraction works devoted to the compositional dependence.
    We have investigated in situ a continuous transition between the orthorhombic and tetragonal phases in double-perovskite-structured La_<0.64>(Ti_<0.92>,Nb_<0.08>)O_3 by three X-ray powder diffractometers with different ~d/d resolutions of 0.03%, 0.06% and 0.10%. The d and ~d denote the λ/(2=sinθ ) and peak width where λ and θ are wavelength of X-ray and Bragg angle. Only the highest-resolution diffractometer of ~d/d =0.03% was able to detect the peaks splitting between 400 and 040 reflections, in the temperature range of 327βC to 339βC. It was found that the accuracy of the transition temperature is considerably improved with decreasing of ~d/d value. The maximum temperature where the peak splitting between 400 and 040 reflections is detectable increases, while the transition temperature determined by a power law decreases with decreasing of ~d/d value.

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  • 紫外ラマン散乱による相変態の新しいその場観察法

    Grant number：10875122  1998 - 1999

    日本学術振興会  科学研究費助成事業  萌芽的研究

    垣花 眞人, 八島 正知, 吉村 昌弘, 垣花 眞人

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    Grant amount：\2100000 （ Direct Cost: \2100000 ）

    セラミックス材料の特性、物性、組織の制御にとって、その構造を高温でその場観察することは非常に重要である。高温での相変態、とくに酸素の微小な変異を伴う無拡散相変態を研究することは、高温材料のセラミックスの特異的な物性や、あるいは材料設計をする上で非常に重要な課題である。そこで、本研究では、紫外光を用いたラマン散乱によるセラミックスの相変態の新しいその場観察法を開発することを目的とした。本研究において、(1)検出効率、操作性、汎用性を向上させた新型紫外ラマン分光システムを試作し、(2)空気中で汎用性の高い超高温(2000℃)ラマン散乱用電気炉の試作を行った。そして、従来困難であった空気中で約2000℃における高温ラマン散乱実験を行い、材料の構造変化をその場で観察することに成功した。セラミックスの分野で相の同定や相変態の観測手段として頻繁に使われるX線回折と異なり、紫外ラマン散乱による本新システムでは、酸素位置の微妙な変位を伴うジルコニア系あるいはハフニア系高温材料の高温での相変態を観測する有力な手法である。このことを証明するために、約1800℃付近に相変態温度のあるハフニア系セラミックスに本システムを適用し、熱輻射による影響のない質の高いラマンスペクトルを高温で得ることに成功し、相変態を明確に観測することができた。このように、セラミック材料の特性、物性、組織の制御にとって重要である、構造を高温でその場観察することが可能な新しい手法に開発することに成功した。

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  • Development of a newly designed ultraviolet Raman scattering system for in-site observation of structure at very high temperature

    Grant number：10555215  1998 - 1999

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KAKIHANA Masato, SIMIDZU Ryosuke, SAKAKI Satoshi, YOSHIMURA Masahiro

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    Grant amount：\11800000 （ Direct Cost: \11800000 ）

    It is of prime importance to observe change in structure of ceramics in-situ at high temperature for controlling materials properties and compositions. In the field of ceramics, since the X-ray diffraction method is most frequently used for phase identification, the technique has been extended to in-situ observation of ceramic structure at high temperature. However, X-ray diffraction techniques are not always suitable for systems like ceramics, where positions of oxygen atoms play a crucial role in determining properties and phase transformations, or for samples comprised of ultra fine powders. For this reason, it is required to develop an alternative to the X-ray diffraction technique, which enables us to carry out studies at high temperatures. To achieve this requirement, we have developed a newly designed Raman scattering system combined with an ultra-violet excitation light source. In ordinary Raman scattering experiments, conventional visible light Ar lasers have been used as excitation sources for Raman spectra. Wavelengths most frequently used for Raman scattering include the blue line at 488 nm and the green line at 515 nm. However, in case where these visible lights are used for Raman scattering experiments at high temperature, a very strong background coming from thermal emissions interfere quite severely with the observation of relatively weak Raman scattering. To overcome this serious problem, we have designed a new Raman scattering system combined with an excitation source having a wave length 363 nm, which made possible to measure Raman spectra at temperatures even higher than 1500℃. We have successfully measured Raman spectra of various high temperature materials (hafnia, zirconia, and perovskite) and clearly observed their phase transformations in situ at high temperatures. For instance, the monoclinic-to-tetragonal transformation of hafnia finished around 2080 K on heating, while the monoclinic phase appeared at 2018 K on cooling.

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  • 超高温用固体電解質の創製とその相安定性

    Grant number：08229216  1996

    日本学術振興会  科学研究費助成事業  重点領域研究

    吉村 昌弘, 八島 正知

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    Grant amount：\2100000 （ Direct Cost: \2100000 ）

    ジルコニア・ハフニア・希土類酸化物・あるいはニオブやタンタルの酸化物は、それらの二元系あるいは三元系において蛍石型あるいはその関連構造を持つ固溶体を生成する。これらの固溶体は新しい高温用固体電解質として極めて有用であるが、それらの生成域、安定性、構造変化などが明らかになっていない。本研究ではこれらの系において、まず組成が均一な試料の合成、X線や中性子線回折による構造解析、マラン散乱による酸素の配列の解明、インピーダンス測定によるイオン伝導度の測定を行った。それらの成果は以下の通りである。
    1)YwO_3-Nb_2O_5系における蛍石型固溶体相の生成と特性
    X線回折により格子定数を調べた結果、蛍石型相の固溶域は1700℃で20-27.5mol% Nb_2O_5であり、それ以下では約2.5mol%までC型Y_2O_3相との共存、それ以上では約50mol%までYNbO_4相との共存となった。これらの相関係はラマン分光分析によっても確認された。
    イオン伝導度はこれらの相関係に依存し、蛍石型相の割合が増えるに従って増大した。特に20mol%Nb_2O_5組成で最大となった。
    2)ZrO_2-Y_2O_3系における正方相、立法相の生成域
    X線回折により見積もられた軸率C/aはYO_<1.5>の濃度増加と共に減少し、14mol%で不連続的に=1になる。そのため多くの既往の研究でここから立方相であると考えられていた。しかしながら中性子線回折あるいはラマン分光によるとさらに高濃度の18-10mol%までは酸素の位置だけが変位し、軸率が=1である正方相(t″)であることが明らかとなった。Yに限らず他の希土類Nd,Sm,ErあるいはYbでも同様に正方相と立方相の境界は18-20mol%にあることが示された。

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  • ジルコニア系における準安定と安定状態図の評価と熱力学モデルの開発

    Grant number：08750782  1996

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    八島 正知

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    Grant amount：\1000000 （ Direct Cost: \1000000 ）

    準安定状態図の評価・確立を行うために,均一な試料(ジルコニア固溶体・ハフニア固溶体)をアーク溶解法あるいは錯体重合法により合成した.この均一な試料をX線回折・ラマン散乱等で評価し,正方相の軸率c/aが1であるにもかかわらず,酸素が変位しているために対称性が正方晶系になっているt"の存在を強く示唆することに成功した.また,クエン酸ゲルを利用することによりジルコニアーカルシア系のt'相を始めて様々な組成範囲で合成することに成功した.共沈法や酢酸ゲル法と比較してこの新手法(クエン酸ゲル法)が均一な試料を合成するに当たり極めて有効であることをラマン散乱を用いて明らかにした.不純物を検出する場合,ラマン散乱はX線回折と異なり結晶性が悪くX線ピークがブロードになりがちな試料に対しても有効であることを初めて示した.ZrO_2-UO_2,ZrO_2-CeO_2-LaO_<1.5>,ZrO_2-YO_<1.5>,ZrO_2-ErO_<1.5>,ZrO_2-ScO_<1.5>系において既往のデータの評価を行い,合理的な状態図を提案した.本課題で重要なのは,平衡状態図だけではなく,準安定相間の相転移温度を相図に書き込んだいわゆる準安定状態図を提案したことにある.さらに,データベース化を行うために,ZrO_2-UO_2系およびZrO_2-CeO_2-LaO_<1.5>系にたいして)格子の安定性パラメータの決定,正則溶体近似による2元系状態図の評価さらに3元系状態図の評価を行うことに成功した.以上の研究により先進材料の材料設計の基礎基盤を固め、そのモデル化に際し先導的な役割をはたすものと期待される。

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  • ソフト溶液プロセスによるセラミック/金属系傾斜機能材料のin situ作製

    Grant number：08243221  1996

    日本学術振興会  科学研究費助成事業  重点領域研究

    吉村 昌弘, 八島 正知

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    Grant amount：\2200000 （ Direct Cost: \2200000 ）

    溶液と金属基板あるいは基材との界面化学反応によってセラミックスを必要な箇所に薄膜や厚膜などとしてその場(in situ)に作製してセラミックス/金属系傾斜機能材料を作るというプロセスを開発することを目的として、本研究では水熱反応のみならず電気化学反応なども利用した5つの研究を行った。得られた知見は以下の通りである。
    (1)チタン合金をCa^<2+>を含むアルカリ溶液中で反応させると表面にCaTiO3膜が生成する。
    (2)チタン金属基材をBa^<2+>またはSr^<2+>,Ca^<2+>を含むアルカリ溶液中で処理するとBaTiO_3,SrTiO_3,CaTiO_3あるいはそれらの固溶体が膜状に生成する。この時チタン金属多孔体や厚粉体を用いると孔の内面が一様に酸化物で覆われる。
    (3)金属間化合物TiAlやTi基あるいはAl基合金は新しい耐熱高温材料として期待されているが、耐酸化性が大きな欠点である。これらの基材を水溶液中で電気化学的に処理して表面に酸化物被膜をコーティングすると耐酸化性が向上する。
    (4)我々は、タングステン基板をBa^<2+>やCa^<2+>を含むアルカリ水溶液中で電気化学処理するとBaWO_4やCaWO_4の結晶が膜状に生成することを見出している。これらの膜は結晶性に優れ、そのままでも蛍光体として作動する。
    (5)Si-C-O系、Si-Ti-C-O系の繊維や他の炭化物基材を数百℃の熱水中で処理すると表面に緻密なカーボン膜が生成し炭化物/炭素複合体となる。

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  • Development of in situ Fabrication of Controlled Ceramics From Aqueous Solutions

    Grant number：07405028  1995 - 1996

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    YOSHIMURA Masahiro, YASHIMA Masatomo

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    Grant amount：\34100000 （ Direct Cost: \34100000 ）

    Basic features of Soft, Solution Processing are discussed. Pioneering research carried out in our laboratory on in situ fabrication of morphology controlled advanced ceramic materials by Soft. Solution Processing (synthesis of double-oxide ABO3.ABO4 films by hydrothermal, electrochemical, hydrothermal-electrochemical maethods, coating of CaTiO3 on TiAl, preparation of carbon films on SiC,hydroxyapatite whiskers and fine powders under hydrothermal conditions) is reviewed. Soft, Solution Processing allows to fabricate in aqueous solutions shaped/sized/oriented ceramics in only one step, without excess energies for firing/sintering or melting and without expensive equipment, providing an environmentally firiendly route for preparation of advanced ceramic materials.

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  • ジルコニア固溶体における対称性:a軸とc軸が等しい正方相の可能性

    Grant number：07750744  1995

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    八島 正知

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    Grant amount：\900000 （ Direct Cost: \900000 ）

    ジルコニア固溶体における相安定性、相関係、相転移に関する研究において、組成が均一な試料の合成は非常に重要である.(ZrO_2)_<1-x>-(RO_<1.5>)_x,(HfO_2)_<1-x>-(RO_<1.5>)_x固溶体をアーク溶解法あるいは焼結法により、(ZrO_2)_<1-x>-(CeO_2)_x固溶体を仮焼した後に約1650℃で焼成することによりあるいは錯体重合法により作製した.ジルコニア固溶体の相転移においては酸素の役割が重要である.正方一立方などの相転移における酸素の挙動、即ち位置及び振動状態をラマン散乱,X線回折および中性子回折によって評価した。リ-トベルト解析を行い、酸素の原子座標と振動パラメータを得た。一連の希土類酸化物を添加するとRO_<1.5>濃度が2-14%の範囲で400反射に分裂が観察された.一方,これより高い濃度では400反射に分裂が見られないのにも拘わらず、正方相のみに特有なラマンバンドが観察された.これは軸率が1に殆ど等しい正方相(t′′)が存在していることを意味している.このように様々な希土類を添加したときにt′′が生成することを報告した例は今まで無く,本研究の成果は非常に意義深い物となった.また,ハフニア(HfO_2)_<1-x>-(RO_<1.5>)_x固溶体において軸率が1に殆ど等しい正方相(t′′)が存在していることを報告したのはおそらく初めての例である.また,t′′の生成する範囲はドーパントの種類とホストの種類に依存せず,14-18モル%であることが明らかになった.

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  • 中性子回折,熱量測定および熱力学計算による正方一単斜構造相転移機構の解明

    Grant number：06750688  1994

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    八島 正知

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    Grant amount：\1000000 （ Direct Cost: \1000000 ）

    ジルコニア固溶体における相安定性、相関係、相転移に関する研究において、組成が均一な試料の合成は非常に重要である.(ZrO_2)_<1-X>-(YO_<1.5>)_×固溶体をアーク溶解法あるいは焼結法により、(ZrO_2)_<1-X>-(CeO_2)_×固溶体を仮焼した後に約1650℃で焼成することによりあるいは錯体重合法により作製した.ジルコニア固溶体の相転移においては酸素の役割が重要である.正方一単斜(t-m)相転移における酸素の挙動、即ち位置及び振動状態を中性子回折およびX線回折によって評価した。リ-トベルト解析を行い、酸素の原子座標と振動パラメータを得た。相安定性の基礎データである転移エンタルピーに関するデータは殆ど無く、定性的なデータでさえ不均一な試料を用いてなされている場合が殆どであった.本研究では組成の均一な試料を合成し、それを用いてt-m転移エンタルピーを定量的に測定する事に成功した。得られた粉末の熱流束型走査型熱量(DSC)測定を5℃/minの加熱冷却速度により行なった。相転移熱はNBSのアルミナあるいは標準金属試料の融解熱により補正するが、この補正およびバックグラウンドの善し悪しにより実験精度が左右されるので再現性、試料の量によりどれだけ測定結果が変わるかなどかなりの検討を行った。DSC測定前後のX線回折測定を行い単斜相の割合を定量して式量当りの転移熱を計算した。転移熱はドーパントの濃度の増加とともに増加した.また,計算状態図をジルコニアーセリア-酸化ランタン系に対して実行し,実験も行って両者の比較から3元系における相互作用パラメータを見積もった.

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  • ラマン分光法および中性子回折によるジルコニアセラミックスの相転移のその場観察

    Grant number：05750607  1993

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    八島 正知

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    Grant amount：\1200000 （ Direct Cost: \1200000 ）

    ZrO_2固溶体における立方-正方相転移にとって軸率c_F/a_Fよりもむしろ酸素の位置が重要である.本研究は酸素の散乱能が比較的大きな中性子線の回折とラマン散乱によりZrO_2-YO_<1.5>およびZrO_2-CeO_2固溶体における酸素変位を研究することを目的としている。
    ZrO_2-YO_<1.5>系ではXRD測定により、組成X=10と12ではt′-ZrO_2のみ、X≧16でt″-ZrO_2またはc-ZrO_2のみ、X=14ではt′と(t″またはc)が共存した.酸素イオンが蛍石型構造の正規のサイトから変位するために生じる、蛍石型構造の112_F禁制反射(正方格子の102反射と等価)の積分強度はYO_<1.5>濃度の増加と共に減少した。X≦16の組成域では102反射が明確に観測されたが、X=18の試料では102反射が明確には検出されえなかった。酸素イオンのc軸方向の原子座標はYO_<1.5>濃度が増加すると共に大きくなった.即ち酸素イオンの変位量c(1/4-z)は減少した.また、ラマン散乱において立方相のスペクトルに対して特徴的な正方相のバンドはイットリアの濃度の増加と共に減少し、このバンドが消失する組成から立方-正方相境界を見積ることが出来ることを見いだした。ZrO_2-CeO_2系ではZrO_2-YO_<1.5>系と同様、酸素の原子座標がCeO_2の濃度と共に増加した。即ち、酸素の変位は小さくなった。XRDの結果ではCeO_2濃度が70モル%以上の組成域で軸率c/aが1に等しくなっている。従って、70-90モル%の組成域ではt″となっていると考えられる。また、CeO_2濃度が増加するにつれて101反射の半価幅はほとんど変化しないが、102反射の半価幅は増加した。これはドメインの大きさが減少することに起因すると考察された。高温でのラマン散乱により80モルの試料では400℃より高温で立方相に転移すると推定された。

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