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

    研究成果: Article査読

    12 被引用数 (Scopus)

    抄録

    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.

    本文言語English
    ページ(範囲)14013-14019
    ページ数7
    ジャーナルJournal of Materials Chemistry
    21
    36
    DOI
    出版ステータスPublished - 2011 9 28

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Chemistry

    フィンガープリント 「Local structural analysis for oxide ion transport in La <sub>0.6</sub>Sr<sub>0.4</sub>FeO<sub>3-δ</sub> cathodes」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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