Oxygen transport properties of Ba0.5Sr0.5Co0.8Fe0.2O3-x and Ca0.5Sr0.5Mn0.8Fe0.2O3-x obtained from permeation and conductivity relaxation experiments

被引：49

作者：

Girdauskaite, E. ^{[1
]}

Ullmann, H. ^{[1
]}

Vashook, V. V. ^{[1
]}

Guth, U. ^{[1
]}

Caraman, G. B. ^{[2
]}

Bucher, E. ^{[2
]}

Sitte, W. ^{[2
]}

机构：

[1] Tech Univ Dresden, D-01062 Dresden, Germany

[2] Univ Min & Met Leoben, Chair Phys Chem, A-8700 Leoben, Austria

来源：

SOLID STATE IONICS | 2008年 / 179卷 / 11-12期

关键词：

perovskite-type oxides; permeability; electrical conductivity relaxation; diffusion; surface exchange;

D O I：

10.1016/j.ssi.2008.02.042

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The oxygen exchange and transport properties of the perovskite-type oxides Ba0.5Sr0.5Co0.8Fe0.2O3-x (BSCF5582) and Ca0.5Sr0.5Mn0.8Fe0.2O3-x (CSMF5582) are investigated by oxygen permeation as well as electrical conductivity relaxation experiments. The temperature dependence of the oxygen permeation flux J(O2) of BSCF5582 in the range 600 <= T/degrees C <= 950 shows a transition from a low temperature region with higher activation energy to a high temperature region with lower activation energy. Complementary, the chemical surface exchange coefficient k(chem), the chemical diffusion coefficient D-chem and their activation energies are determined from conductivity relaxation experiments in the ranges 600 <= T/degrees C <= 750 and 70 < pO(2)/Pa < 3000. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：385 / 392

页数：8

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