Electrical properties of SnO2 based varistor ceramics with CuO addition

被引：17

作者：

Gaponov, A. V. ^{[2
]}

Glot, A. B. ^{[1
]}

机构：

[1] Univ Tecnol Mixteca, Huajuapan De Leon 69000, Oaxaca, Mexico

[2] Dniepropetrovsk Natl Univ, UA-49050 Dnepropetrovsk, Ukraine

来源：

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS | 2010年 / 21卷 / 04期

关键词：

OXIDE; CONDUCTIVITY; HUMIDITY;

D O I：

10.1007/s10854-009-9916-1

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Current-voltage characteristics, temperature dependences of the low-field dc conductivity and the relative dielectric permittivity of tin dioxide based SnO2-Co3O4-Nb2O5-Cr2O3 ceramics with CuO addition in the range 0-8 mol% are studied. These materials exhibit non-Ohmic conduction (the varistor effect). If 0.5 mol% CuO is added, the nonlinearity coefficient is increased from 54 to 75 and the electric field at fixed current density is decreased from 628 to 390 kV m(-1). Higher amounts of CuO substantially diminish non-Ohmic behaviour. Thickness dependence of the nonlinearity coefficient and the electric field at fixed current density in SnO2 varistor ceramics is observed. Electrical properties are discussed in the frames of grain-boundary controlled conduction mechanism.

引用

页码：331 / 337

页数：7

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