Abstract
The chemical diffusion coefficient, D ̃ , of oxygen in La 1.7Sr 0.3CuO 4 − δ in a temperature range of 800~1000 °C was estimated with the analysis of weight relaxation behaviour for the step change of oxygen partial pressure using high temperature gravimetry. The analysis was carried out using numerical approximations of the analytical solution of the diffusion equation, the method of which was optimized in this study. Vacancy diffusion coefficients, D v , were also calculated using D ̃ and oxygen nonstoichiometry data. Both D ̃ and D v showed smaller values than those of other conducting oxides with perovskite-family structure and their temperature dependence was Arrehenius type with an activation energy of 1.66 eV. These results are essentially consistent with those for La 1.74Sr 0.26CuO 4 − δ reported by Fueki and coworkers.
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