Oxygen transport kinetics in SrFeO3-δ, La0.5Sr0.5FeO3-δ, and La0.2Sr0.8Cr0.2Fe0.8O3-δ measured by electrical conductivity relaxation

被引：90

作者：

Yoo, J ^{[1
]}

Verma, A

Wang, SY

Jacobson, AJ

机构：

[1] Univ Houston, Dept Chem, Ctr Mat Chem, Houston, TX 77204 USA

[2] General Elect Power Syst, Torrance, CA 90502 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2005年 / 152卷 / 03期

关键词：

D O I：

10.1149/1.1854617

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The chemical diffusion and surface exchange coefficients were measured for SrFeO3-delta, La(0.5)Sr(0.5)feO(3-delta), and La(0.2)Sr(0.8)Cr(0.2)fe(0.8)O(3)-(delta) at 790 <= T <= 1000 degrees C and 0.01 <= pO(2) <= 1 atm by electrical conductivity relaxation. Values of the chemical diffusion (D-chem) and surface exchange (k(chem)) coefficients were obtained by monitoring the variation of electrical conductivity after an abrupt change in oxygen partial pressure. The vacancy diffusion coefficient (D-v), oxygen ion self-diffusion coefficient (D-o), and surface exchange coefficients at thermal equilibrium (k(ex)) were calculated using the measured thermodynamic factors and were compared with literature data for other compositions. (c) 2005 The Electrochemical Society. [DOI: 10. 1149/1.1854617] All rights reserved.

引用

页码：A497 / A505

页数：9

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