Electrical Properties of Varistors Based on Zinc Oxide Doped with Metal Oxide

Abstract

UDC 621.315.592.4

The article shows the results of the studies of current-voltage characteristics, of the temperature and frequency dependences of the dielectric permittivity and electro-conductivity of voltage-dependent resistors (varistors) based on the zinc oxide doped with metal oxides on the alternating current. It is shown that in the frequency range of 200–500 kHz, for the electro-conductivity, the following rule is applied (0.4 < S > 0.8), confirming the hopping mechanism of the charge transfer states localized near the Fermi level.

Keywords: varistor, current-voltage characteristics, temperature and frequency dependence, dielectric permittivity.