Nonlinear electrical properties of grain boundaries in oxygen ion conductors: Acceptor-doped ceria

被引：44

作者：

Guo, X ^{[1
]}

Mi, SB ^{[1
]}

Waser, R ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2005年 / 8卷 / 01期

关键词：

D O I：

10.1149/1.1830393

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Owing to the positively charged grain boundary cores in acceptor-doped ZrO2 and CeO2, oxygen vacancies are depleted in the space charge layers. The validity of this space charge concept was checked for Y2O3-doped CeO2 ceramic of high purity. Electrical fields up to 2 x 10(5) V cm(-1) were applied to the grain boundaries of 1.0 mol % Y2O3-doped CeO2 at 400 degrees C in air, and the grain boundary properties were separated by means of impedance spectroscopy. It was discovered that the current-voltage relation for individual grain boundary was nonlinear, and that the effective grain boundary thickness increased with increasing bias, which supports the space charge concept. (C) 2004 The Electrochemical Society.

引用

页码：J1 / J3

页数：3

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