Oxygen permeation modelling of perovskites


Hassel, Bart A. van and Kawada, Tatsuya and Sakai, Natsuko and Yokokawa, Harumi and Dokiya, Masayuki and Bouwmeester, Henny J.M. (1993) Oxygen permeation modelling of perovskites. Solid State Ionics, 66 (3-4). pp. 295-305. ISSN 0167-2738

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Abstract: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.
Item Type:Article
Copyright:© 1993 Elsevier Science
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/12669
Official URL:https://doi.org/10.1016/0167-2738(93)90419-4
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