Oxygen nonstoichiometry and exchange kinetics of Ba0.5Sr0.5Co0.8Fe0.2O3-δ

被引：167

作者：

Bucher, Edith ^{[1
]}

Egger, Andreas ^{[1
]}

Ried, Peter ^{[2
]}

Sitte, Werner ^{[1
]}

Holtappels, Peter ^{[2
]}

机构：

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

[2] Empa, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland

来源：

SOLID STATE IONICS | 2008年 / 179卷 / 21-26期

关键词：

perovskite oxide; BSCF; oxygen nonstoichiometry; oxygen exchange; conductivity relaxation;

D O I：

10.1016/j.ssi.2008.01.089

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 nonstoichiometry of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF5582) was investigated by thermogravimetry resulting in values of 2.40 <(3 - delta)< 2.57 for the equilibrium oxygen content in the range 600 <= T/degrees C <= 900 and 1E-4 < pO(2)/bar < 0.4. The oxygen exchange kinetics was studied by electrical conductivity relaxation as a function of temperature in the range 550 <= T/degrees C <= 725 with chemical diffusion coefficients 1E-6 < D-chem/cm(2) s(-1) < 3E-5 and (k(chem)) = 64 +/- 12 kJ mol(-1). Self-diffusion and surface exchange coefficients, as well as ionic conductivities are estimated. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：1032 / 1035

页数：4

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