Preparation, characterization and dielectric response of a high-breakdown-field ZnO-based varistor

Microstructure and Electrical Properties of In2O3, La2O3 and Ga2O3 Doped ZnO-Bi2O3-MnO2-SiO2-TiO2 Varistor Ceramics

“…Generally, trace metal oxides such as Bi 2 O 3 , MnO 2 , Co 2 O 3 and SiO 2 are doped during the preparation of ZnO varistor ceramics. [10][11][12][13] Doping of SiO 2 , MnO 2 , Co 2 O 3 or other oxides is an important factor for improving the performance of ZnO-Bi 2 O 3 varistors, which can enhance the nonlinear coefficient and voltage gradient. [14][15][16] Bai et al 14 found that when the amount of SiO 2 doping was 2 wt.%, the nonlinear coefficient of ZnO varistors was 73.68.…”