Oxygen permeation modelling of perovskites

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

doi:10.1016/0167-2738(93)90419-4

Oxygen permeation modelling of perovskites

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

Research output: Contribution to journal › Article › peer-review

144 Citations (Scopus)

Abstract

A point defect model was used to describe the oxygen nonstoichiometry of the perovskites La_0.75Sr_0.25CrO₃, La_0.9Sr_0.1FeO₃, La_0.9Sr_0.1CoO₃ and La_0.8Sr_0.2MnO₃ 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 language	English
Pages (from-to)	295-305
Number of pages	11
Journal	Solid State Ionics
Volume	66
Issue number	3-4
DOIs	https://doi.org/10.1016/0167-2738(93)90419-4
Publication status	Published - 1993 Nov
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1016/0167-2738(93)90419-4

Cite this

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title = "Oxygen permeation modelling of perovskites",

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.",

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T1 - Oxygen permeation modelling of perovskites

AU - van Hassel, Bart A.

AU - Kawada, Tatsuya

AU - Sakai, Natsuko

AU - Yokokawa, Harumi

AU - Dokiya, Masayuki

AU - Bouwmeester, Henny J.M.

PY - 1993/11

Y1 - 1993/11

N2 - 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.

AB - 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.

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Oxygen permeation modelling of perovskites

Abstract

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