Local structural analysis for oxide ion transport in La0.6Sr0.4FeO3−δ cathodes

Yuki Orikasa; Takayuki Nakao; Masatsugu Oishi; Toshiaki Ina; Atsushi Mineshige; Koji Amezawa; Hajime Arai; Zempachi Ogumi; Yoshiharu Uchimoto

doi:10.1039/C1JM11358E

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Local structural analysis for oxide ion transport in La_0.6Sr_0.4FeO_3−δ cathodes†

Yuki Orikasa,*^a Takayuki Nakao,^b Masatsugu Oishi,^a Toshiaki Ina,^b Atsushi Mineshige,^c Koji Amezawa,^d Hajime Arai,^a Zempachi Ogumi^a and Yoshiharu Uchimoto^b

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* Corresponding authors

^a Office of Society-Academia Collaboration for Innovation, Kyoto University, Yoshida-nihonmatsu-cho, Kyoto, Japan
E-mail: orikasa.yuuki.2a@kyoto-u.ac.jp

^b Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto, Japan

^c Graduate School of Engineering, University of Hyogo, Himeji, Hyogo, Japan

^d Graduate School of Environmental Studies, Tohoku University, Aoba-ku, Sendai, Japan

Abstract

The relationship between the local structural changes and the oxide ion diffusion in La_0.6Sr_0.4FeO_3−δ was investigated. The oxygen vacancy concentration in La_0.6Sr_0.4FeO_3−δ was varied by annealing under various oxygen partial pressures. Local structural changes of La_0.6Sr_0.4FeO_3−δ with the introduction of oxygen vacancies were studied by the extended X-ray absorption fine structure (EXAFS) analysis. Oxygen vacancies are preferentially introduced near the La ions and local distortion around the oxygen vacancies is induced. The oxygen vacancy diffusion coefficient, D_v was calculated by means of electrical conductivity measurement. D_v decreased with increasing local distortion around the oxygen vacancy. Activation energies for D_v strongly depended on the bottle-neck size calculated from the result of EXAFS.

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Article information

DOI: https://doi.org/10.1039/C1JM11358E
Article type: Paper
Submitted: 31 Mar 2011
Accepted: 12 Jul 2011
First published: 08 Aug 2011

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J. Mater. Chem., 2011,21, 14013-14019

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Local structural analysis for oxide ion transport in La_0.6Sr_0.4FeO_3−δ cathodes

Y. Orikasa, T. Nakao, M. Oishi, T. Ina, A. Mineshige, K. Amezawa, H. Arai, Z. Ogumi and Y. Uchimoto, J. Mater. Chem., 2011, 21, 14013 DOI: 10.1039/C1JM11358E

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Journal of Materials Chemistry