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.
ASJC Scopus subject areas
- Materials Chemistry