Oxygen permeation modelling of perovskites

Bart A. van Hassel, Tatsuya Kawada, Natsuko Sakai, Harumi Yokokawa, Masayuki Dokiya, Henny J.M. Bouwmeester

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A point defect model was used to describe the oxygen nonstoichiometry of the perovskites La0.75Sr0.25CrO3, La0.9Sr0.1FeO3, La0.9Sr0.1CoO3 and La0.8Sr0.2MnO3 as a function of the oxygen partial pressure. Form the oxygen vacancy concentration predicte by the point defect model, the ionic conductivity was calculated assuming a vacancy diffusion mechanism. The ionic conductivity was combined with the Wagner model for the oxidation of metals to yield an analytical expression for the oxygen permeation current density as a function of the oxygen partial pressure gradient. A linear boundary condition was used to show the effect of a limiting oxygen exchange rate at the surface.
Original languageEnglish
Pages (from-to)295-305
Number of pages11
JournalSolid state ionics
Issue number3-4
Publication statusPublished - 1993


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