Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1297821 | Solid State Ionics | 2009 | 5 Pages |
Abstract
Mixed electron hole and oxide ion conducting perovskite-type oxides, La0.8Sr0.2(Ga0.8Mg0.2)1 â xCrxO3 â δ (0 â¤Â x â¤Â 1.0), were prepared by solid state reaction. The phase stability and the oxygen permeation properties of the oxides were examined as a function of the content of Cr. La0.8Sr0.2(Ga0.8Mg0.2)1 â xCrxO3 â δ has a perovskite related tetragonal phase with x = 0.1 to 0.8. The total electrical conductivity of La0.8Sr0.2(Ga0.8Mg0.2)1 â xCrxO3 â δ increases with increasing x. The oxygen permeation flux across the La0.8Sr0.2(Ga0.8Mg0.2)1 â xCrxO3 â δ membranes at higher temperatures increases with x up to x = 04. The maximum oxygen permeation flux of 1.6 Ã 10â 7 molâ 1 cmâ 2 at 1100 °C in a oxygen activity gradient of air/10â 2 Pa is observed in La0.8Sr0.2(Ga0.8Mg0.2)0.6Cr0.4O3 â δ. This perovskite-type oxide is stable under an oxygen partial pressure of 7 Ã 10â 10 Pa at 1000 °C.
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Authors
J. Ishida, K. Murata, T. Ichikawa, A. Hirano, N. Imanishi, Y. Takeda, O. Yamamoto,