Study of Mechanism of Mixed Conduction Due to Electrons and Oxygen Ions in (La0.75Sr0.25)MnO3.00 and (Ba0.5Sr0.5)(Co0.8Fe0.2)O2.33 through Rietveld Refinement and MEM Analysis
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概要
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In this study, we have analyzed the mechanism of mixed conduction due to electrons and oxygen ions in (La0.75Sr0.25)MnO3.00 (LSM) and (Ba0.5Sr0.5)(Co0.8Fe0.2)O2.33 (BSCF) by using the Rietveld refinement technique and the maximum entropy method (MEM). Using neutron diffraction measurements, we showed that the site occupancies of the O1 (4c) and O2 (8d) sites in BSCF are 0.59 and 0.87, respectively. Further, the MEM analysis of synchrotron X-ray diffraction measurements revealed that the Mn-O plane in LSM has a strong, isotropic covalent bond that enables conduction of electrons. The (Co,Fe)-O2 plane with a covalent bond and a low concentration of oxygen vacancies in BSCF can also conduct electrons. On the other hand, the (Ba,Sr)-O1 plane in BSCF, which has a high concentration of oxygen vacancies, large isotropic displacement parameter (Uiso) values, and a strong ionic bond, is responsible for the diffusion of oxygen ions.
著者
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Kitamura Naoto
Department Of Internal Medicine Keio University School Of Medicine
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Igawa Naoki
Quantum Beam Science Directorate Japan Atomic Energy Agency
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Hirosawa Ichiro
Japan Synchrotron Radiation Res. Inst. (jasri) Hyogo Jpn
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Idemoto Yasushi
Department Of Industrial Chemistry Faculty Of Science And Technology Science University Of Tokyo
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Osaka Keiichi
Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Sayo, Hyogo 679-5198, Japan
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SHIRASAKI Saori
AGCSeimichemical Co., Ltd.
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ITOH Takanori
AGCSeimichemical Co., Ltd.
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FUJIE Yoshinori
AGCSeimichemical Co., Ltd.
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OSAKA Keiichi
Japan Synchrotron Radiation Research Institute (JASRI), SPring-8
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HIROSAWA Ichiro
Japan Synchrotron Radiation Research Institute (JASRI), SPring-8
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IDEMOTO Yasushi
Department of Industrial and Engineering Chemistry, Faculty of Science and Technology, Tokyo University of Science
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IDEMOTO Yasushi
Department of Pure and Applied Chemistry, Faculty of Science & Technology, Tokyo University of Science
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