Electrical properties of SnO₂ ceramic varistors withstanding high current pulses

 

Glot A. B. *, ª, Lu Z. Y. ^b, Zhou Z. Y. ^b and Ivon A. I. ^c

 

ª Universidad Tecnológica de la Mixteca Huajuapan de León, Oaxaca, 69000, México. * On leave from Dniepropetrovsk National University Dniepropetrovsk, 49010, Ukraine (alexglot@mixteco.utm.mx, alexglot@mail.ru)

^b South China University of Technology Guangzhou, 510640, China

^c Dniepropetrovsk National University Dniepropetrovsk, 49010, Ukraine

 

Recibido: 20 de abril de 2011
Aceptado: 11 de junio de 2011

 

Abstract

Electrical properties of new dense SnO₂-CoO-Nb₂O₅-Cr₂O₃-Y₂O₃ varistor ceramics are studied. Current-voltage characteristics in the wide range from 10^-11 to about 3.3·10³ A·cm^-2 contain three regions. At low currents linear (Ohmic) region is found. Highly nonlinear region with the nonlinearity coefficient of about 50 at 1 mA·cm^-2 is observed between 10^-6 and 1 A·cm^-2. At higher currents the upturn region is revealed. In this region the slope of current-voltage characteristic in the double logarithmic scale is decreased. The increase in dc current on time at fixed voltage and the hysteresis in the ac current-voltage characteristic are observed. These features can be related to Joule heating or electronic processes. However, after the high-current pulses only minor changes at low current are found. This indicates that studied ceramics withstand high-current overloads. This fact can be attributed to the formation of quite identical electrically-active grain boundaries throughout a sample. The grain resistivities estimated from high-current pulse data are the lowest known up to now for SnO₂ varistors.

Keywords: Grain boundary; Non-Ohmic conduction; Potential barrier; Pulse stability; Tin dioxide; Varistor.

 

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Note

The Editors thank to the Physics Department of the Centro de Investigación y de Estudios Avanzados del IPN for the support in the publication of this issue, and the cooperation of M en C. Alejandra García Sotelo and Eng. Erasmo Gómez.