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The present study focuses on the effect of indium doping on the microstructure and electrical properties of Y-doped ZnO varistor ceramics. At a given concentration of the rare-earth element yttrium, the leakage currents of sintered varistors first decreased markedly with increased indium doping, before increasing at higher doping levels. The nonlinear coefficient showed the opposite trend. A fraction...
In this paper, AC ageing characteristics of high voltage gradient ZnO varistors doped with different Y 2 O 3 concentration were investigated. The voltage gradient of these samples is markedly improved by increasing Y 2 O 3 content, however, the nonlinear coefficient decreases and the leakage current increases at the same time. Y 2 O 3 -doped ZnO samples...
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