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In this paper discussions on ZnO based varistor ceramics doped with different ratios of Y2O3 are presented. Analysis on the phase and microstructures of the samples indicates that an additional phase is detected in the samples doped with Y2O3, and the average grain size of the specimens decreases from about 9.2 µm to 4.5 µm, with an increase in the addition of Y2O3 from 0 mol% to 3 mol%. The corresponding...
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