Oxygen transport in La1-xSrxMn1-yCoyO3±δ perovskites part II.: Oxygen surface exchange

被引：229
作者：
De Souza, RA [1 ]
Kilner, JA [1 ]
机构：
[1] Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2BP, England
来源：
SOLID STATE IONICS | 1999年 / 126卷 / 1-2期
关键词：
oxygen exchange; surface; perovskite oxide; LaMnO3LaCoO3;
D O I：
10.1016/S0167-2738(99)00228-3
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 kinetics of oxygen surface exchange are discussed for selected compositions in the perovskite oxide system La1-xSrxMn1-yCoyO3=delta. In particular the relationship between the two parameters measured by the O-18/O-16 Isotope Exchange Depth Profile (IEDP) method, the oxygen surface exchange coefficient, k*, and the oxygen tracer diffusion coefficient, D*, is examined. The strong correlation observed between k* and D* is interpreted in terms of oxygen vacancies playing a major role in the surface exchange process for these materials. The relationship between k* and D* for La1-xSrxMn1-yCoyO3=delta compositions is compared to that seen for other acceptor-doped perovskites and some acceptor doped fluorites. Such comparisons yield important implications for electrochemical devices utilising such acceptor-doped oxides, (C) 1999 Published by Elsevier Science BN. All rights reserved.
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页码：153 / 161
页数：9
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