Abstract
The microstructure, nonlinear properties, and dielectric characteristics of the varistors, which are composed of ZnO–Pr 6O 11–CoO–Cr 2O 3–Dy 2O 3-based ceramics, were investigated at various CoO contents. The increase of CoO content improved the densification of ceramics as increasing density in the range of 5.25–5.55 g/cm 3. The CoO served as a prompter of grain growth as increasing average grain size from 9.9 to 27.2 μm. The varistor voltage decreased from 235.3 to 86.0 V/mm with increasing CoO content. The highest nonlinearity was obtained from the varistors with 1.0 mol% CoO, with 66.6 in nonlinear exponent and 1.2 μA in leakage current. The further CoO addition decreased the nonlinearity.
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