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Diffusion coefficient of oxygen in La1.7Sr0.3CuO4 − δ

✍ Scribed by Hideki Kanai; Takuya Hashimoto; Hiroaki Tagawa; Junichiro Mizusaki

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
586 KB
Volume
99
Category
Article
ISSN
0167-2738

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✦ Synopsis

The chemical diffusion cocfticient, B, of oxygen in La, ,Sr~, ,CuO, ij in a temperature range of 8OO-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, I>+ were also calculated using I? and oxygen nonstoichiometry data. Both d and D,. showed smaller values than those of other conducting oxides with pcrovskite-family structure and their temperature dependence was Arrehenius type with an activation energy of I .66 cV.

These results are essentially consistent with those for La,,74Sr0,26Cu0,,_-R reported by Fueki and coworkers.

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