Local structural analysis for oxide ion transport in La 0.6Sr0.4FeO3-δ cathodes

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

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    11 Citations (Scopus)

    Abstract

    The relationship between the local structural changes and the oxide ion diffusion in La0.6Sr0.4FeO3-δ was investigated. The oxygen vacancy concentration in La0.6Sr 0.4FeO3-δ was varied by annealing under various oxygen partial pressures. Local structural changes of La0.6Sr 0.4FeO3-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, Dv was calculated by means of electrical conductivity measurement. Dv decreased with increasing local distortion around the oxygen vacancy. Activation energies for Dv strongly depended on the bottle-neck size calculated from the result of EXAFS.

    Original languageEnglish
    Pages (from-to)14013-14019
    Number of pages7
    JournalJournal of Materials Chemistry
    Volume21
    Issue number36
    DOIs
    Publication statusPublished - 2011 Sep 28

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Chemistry

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    Orikasa, Y., Nakao, T., Oishi, M., Ina, T., Mineshige, A., Amezawa, K., Arai, H., Ogumi, Z., & Uchimoto, Y. (2011). Local structural analysis for oxide ion transport in La 0.6Sr0.4FeO3-δ cathodes. Journal of Materials Chemistry, 21(36), 14013-14019. https://doi.org/10.1039/c1jm11358e