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The ZnO-Bi2O3-MnO2-xSiO2 (ZBMS) varistor was prepared at a low sintering temperature of 880°C via the conventional solid state method. The phase transformation, microstructure, and electrical properties of the ZBMS varistor were studied as a function of doping amount of SiO2. It is showed that the growth of ZnO grain is restrained by the introducing of SiO2; and the grain size decreases from 4.68μm...
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