Abstract
The sintering effect on the microstructure, electrical properties, and dielectric characteristics of ZnO–V2O3–Cr2O3-based ceramics was investigated. With the increase of sintering temperature from 950 to 1250 °C, the density of the sintered pellets decreased from 98.2 to 97.5% and the average grain size increased from 15.95 to 24.65 μm. The breakdown field decreased noticeably from 127.5 to 67 V/cm with the increase of sintering temperature. The varistor ceramics sintered at 1050 °C exhibited the best nonlinear properties: 11.6 in the nonlinear coefficient. The dielectric constant in frquence 10 kHz increased sharply from 1862 to 2790 with the increase of sintering temperature. On the whole, the dielectric loss exhibited a fluctuation with the increase of the sintering temperature, and a minimum value of 0.0098 at 950 °C.
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