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Silver in the form of AgNO3 was added to ZnO-based varistor ceramics prepared by the solid-state reaction method. The effects of AgNO3 on both the microstructure and electrical properties of the varistors were studied in detail. The optimum addition amount of AgNO3 in ZnO-based varistors was also determined. The mechanism for grain growth inhibition by silver doping was also proposed. The results...