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The effect of different molar ratios of Y2O3 and Y(NO3)3 on the microstructure and electrical response of ZnO-Bi2O3-based varistor ceramics sintered at 1 000 °C was investigated, and the mechanism by which this doping improves the electrical characteristics of ZnO-Bi2O3-based varistor ceramics was discussed. With increasing amounts of Y(NO3)3 or Y2O3 in the starting composition, Y2O3, Sb2O4 and Y-containing...
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