Eur. Phys. J. AP
Volume 16, Number 1, October 2001
|Page(s)||3 - 9|
|Section||Semiconductors and Devices|
|Published online||15 October 2001|
Nonlinear electrical properties of cobalt doped SnO2·Ni2O3·Nb2O5 varistors
Department of Physics, Shandong University, Jinan 250100, PR China
2 Experiment Center, Shandong University, Jinan 250105, PR China
Corresponding author: email@example.com
Revised: 30 May 2001
Accepted: 8 June 2001
Published online: 15 October 2001
A new varistor system of SnO2·Ni2O3·Nb2O5 exhibits the relative dissatisfactory physical and electrical properties. The effect of cobalt oxide on the properties of the SnO2·Ni2O3·Nb2O5 varistors was investigated by measuring the densities, permittivities, the current-voltage properties and the properties of the defect barriers. It is found that the sample doped with 0.25 mol% Co2O3 exhibits the abnormal poorer electrical properties than the samples without Co2O3 dopants. However, the sample doped with 6.0 mol% Co2O3 exhibits the highest nonlinear coefficient () and reference electrical field ( V/mm), although the sample doped with 1.0 mol% Co2O3 exhibits the highest densities ( g/cm3) and permittivities. The sample with 6.0 mol% Co2O3 bears the highest barriers, but the sample with 1.0 mol% Co2O3 shows the narrowest barriers. The investigation of the sintering temperature shows that the samples sintered at 1450 °C exhibit the better physical and electrical properties. The results were discussed and the defect barrier model was also introduced to explain.
PACS: 73.30.+y – Surface double layers, Schottky barriers, and work functions / 72.20.Ht – High-field and nonlinear effects
© EDP Sciences, 2001
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