X-ray photoelectron spectroscopy investigation on chemical states of oxygen on surfaces of mixed electronic-ionic conducting La0.6Sr0.4Co1-yFeyO3 ceramics

被引：65

作者：

Xu, Q ^{[1
]}

Huang, DP ^{[1
]}

Chen, W ^{[1
]}

Wang, H ^{[1
]}

Wang, BT ^{[1
]}

Yuan, RZ ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2004年 / 228卷 / 1-4期

关键词：

La0.6Sr0.4Co1-yFeyO3; perovskite-type ceramics; XPS; chemical state; oxygen; mixed electronic-ionic conducting properties;

D O I：

10.1016/j.apsusc.2003.12.030

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 chemical state of oxygen on the surfaces of mixed electronic-ionic conducting La0.6Sr0.4Co1-yFeyO3 ceramics was characterized by X-ray photoelectron spectroscopy (XPS). It was ascertained that there are five different kinds of oxygen on the ceramic surfaces, including lattice oxygen (O-L), chemisorbed oxygen (O-C) in the forms of O2-, O-, and O-2(-), and oxygen in hydroxyl environment (O-H). The concentration of O-C + O-H relative to total detected oxygen enhanced with the increase of Co/Fe ratio. In order to examine the relation between the chemical states of oxygen on the surfaces and the electrical nature of the ceramics, the mixed electronic-ionic conducting properties were investigated. At an identical measuring temperature, the electronic conductivity and ionic conductivity of La0.6Sr0.4Co1-yFeyO3 ceramics tended to rise with the increase of Co/Fe ratio. It was considered that the mixed electronic-ionic conducting properties Lire responsible for the complex chemical states of oxygen on the ceramic surfaces. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：110 / 114

页数：5

共 17 条

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