Modulated Structure of Misfit Layered Cobalt Oxide [(Ca0.90Bi0.10)2(Co0.95Bi0.05)O3]pCoO2
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概要
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We have determined the crystal structure of Bi-substituted and Bi-free misfit layered cobalt oxides [Ca2CoO3]0.62CoO2, by a (3+1)-dimensional superspace group approach. Structural parameters have been refined with a superspace group of $C2/m(1p0)s0$ using powder neutron diffraction data. Bismuth atoms are found to substitute for both Ca and Co atoms in the rock salt-type [Ca2CoO3] subsystem. The resulting structural formula is expressed as [(Ca0.90Bi0.10)2(Co0.95Bi0.05)O3]pCoO2 with a refined $b$-axis ratio of $p=0.6183$. By Bi substitution, the modulation of the Co–O distances in the [Ca2CoO3] subsystem is markedly decreased relative to the Bi-free counterpart, whereas such a modulation in the [CoO2] subsystem is slightly increased. The observed increase in the Seebeck coefficient and electrical resistivity of the Bi-substituted phase can be explained in terms of the decrease in hole concentration in the CoO2 sheets.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-09-15
著者
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Morii Yukio
Advanced Science Research Center Japan Atomic Energy Research Inst.
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Suzuki Yousuke
Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University
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Ishii Yoshinobu
Advanced Science Research Center Japan Atomic Energy Agency
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Onoda Mitsuko
Advanced Materials Laboratory National Institute For Materials Science
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Kajitani Tsuyoshi
Department Of Applied Physian Fuaully Of Engineering Tohoku University
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Miyazaki Yuzuru
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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Ishii Yoshinobu
Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
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Kajitani Tsuyoshi
Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan
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Onoda Mitsuko
Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
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Suzuki Yousuke
Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan
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Morii Yukio
Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
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