Oxygen surface exchange in mixed ionic electronic conductors:: Application La0.5Sr0.5Fe0.8Ga0.2O3-δ

被引：87

作者：

Kim, S ^{[1
]}

Wang, S ^{[1
]}

Chen, X ^{[1
]}

Yang, YL ^{[1
]}

Wu, N ^{[1
]}

Ignatiev, A ^{[1
]}

Jacobson, AJ ^{[1
]}

Abeles, B ^{[1
]}

机构：

[1] Univ Houston, Mat Res Sci & Engn Ctr, Houston, TX 77204 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2000年 / 147卷 / 06期

关键词：

D O I：

10.1149/1.1393544

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We propose an oxygen surface exchange model in which the effect of vacancies at the gas-mixed ionic electronic conductor interface are included and apply the model to isotope exchange, oxygen permeability, and electrical conductivity relaxation. We deduce relationships between the surface-exchange coefficients associated with these phenomena and extend the treatment of the conductivity relaxation to large changes in oxygen partial pressure, where the commonly used assumption of first Order reaction rate breaks down. We apply the model to interpret the permeation and electrical conductivity relaxation measurements in La0.5Sr0.5Fe0.8Ga0.2O3-delta. Transport in the material is almost completely surface limited, and data were interpreted in terms of a single surface-exchange coefficient. (C) 2000 The Electrochemical Society. S0013-4651(99)11-057-7. All rights reserved.

引用

页码：2398 / 2406

页数：9

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