Electrical Parameters of SnO2 Based Varistor Ceramics  with CaO and BaO Additions

A.V. Gaponov; O.V. Vorobiov; A.M. Vasyliev

doi:10.15330/pcss.17.1.81-87

Authors

A.V. Gaponov Oles’ Gonchar Dnipropetrovs’k National University
O.V. Vorobiov Oles’ Gonchar Dnipropetrovs’k National University
A.M. Vasyliev Oles’ Gonchar Dnipropetrovs’k National University

DOI:

https://doi.org/10.15330/pcss.17.1.81-87

Keywords:

varistor, ceramics, grain boundary, electric conductivity, specific resistance, grain size

Abstract

In the tested SnO₂-Co₃O₄-Nb₂O₅-Cr₂O₃-CuO varistor ceramics the adding of CaO or BaO oxides leads to the decrease of the electric conductivity in the low electric field and correlated increase of the potential barrier height at the SnO₂ grain boundaries (from 0.7 to 1.0 eV). The coordinated changes of electrical parameters with the increase of the burning temperature from 1520 to 1620 К (the increase of the linear shrinkage, a grain size, an electric conductivity, a nonlinear coefficient , a normalized nonlinear coefficient , a dielectric permittivity and the decrease of the qualifying electric field E₁, an activation energy of electric conduction and a grain specific resistance) prove the barrier mechanism of electric conductivity in the SnO₂ based ceramics. The highest data and = 0.02 cm·V^-1 has ceramics with CaO addition baked at 1620 K. According to the impulse experimental data in the high electric field the increase of burning temperature causes the increase of SnO₂ grain average size and the decrease of their grain specific resistance . The obtained value = 1.1 Ohm·cm for SnO₂-Co₃O₄-Nb₂O₅-Cr₂O₃-CuO ceramics is the lowest among those found in SnO₂ based ceramics.

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