This work reports on homogeneous varistor ceramics prepared from a mixture of impurity-doped zinc oxide (C) [E. Suzuki et al., IEEE Trans. Electron Dev. 47, 354 (2000); F.L. Souza et al., Mater. Chem. Phys. 80, 512 (2003)] and nonpolar polyethylene (PE) using a hot pressing method. The content of the composite components was varied from 10% (90%) to 70% (30%) of C (PE) and the thickness of the samples obtained was 40 or 150 µm. The voltage-current characteristics and electroconductivity with applied voltage were measured for all the samples obtained at room temperature. Also, the same samples were tested using infrared absorption and X-ray diffraction methods. As a result of these studies, the influence of ceramic composition on the ceramic parameters was established.

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The present paper is devoted to studying the effect of dc voltage on the amount of electrical capacitance in pure bentonite, composites and semiconductors with different conductivity, as well as the dependence of electrical conductivity on the external field. The reason for the dependence of the capacitance on the DC voltage may be the presence of potential barriers in them and the dependence of the electrical conductivity (σ) on the applied voltage. In those samples where there is a large range of variation of σ, there are also large changes in electrical capacitance. The principle of a change in electrical conductivity, a change in the electrical capacitance is observed, can be successfully used in microelectronics, electrical engineering, etc. Created capacities parameters can changed in a wide range of voltage and temperature.

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