Non-stoichiometry, Fermi energy and work function of (La,Sr)MnO3. II. Verification of theoretical model

被引：8

作者：

Bak, T ^{[1
]}

Nowotny, J ^{[1
]}

Rekas, M ^{[1
]}

Sorrell, CC ^{[1
]}

机构：

[1] Univ New S Wales, Ctr Mat Res Energy Convers, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2001年 / 62卷 / 04期

关键词：

oxides; surfaces;

D O I：

10.1016/S0022-3697(00)00231-6

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A model describing the relationship between nonstoichiometry and Fermi energy was used to determine the effect of oxygen partial pressure on semiconducting properties of perovskite-type oxide materials, such as (La,Sr)MnO3. Specifically, this model was used to determine the electrical effects at the gas/solid interface for the oxygen/metal oxide system with specific rr:spect to oxygen non-stoichiometry and oxygen chemisorption. It was found that oxidation of (La0.8Sr0.2)MnO3 at both 1023 and 1073 K, corresponding to changes of p(O-2) in the range 10 and 21 kPa, results in the formation of a chemisorption-related surface potential barriers that assumes 0.165 V while oxidation at 1123 K leads to oxygen incorporation without changes in chemisorption equilibrium. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：737 / 742

页数：6

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