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Summary form only given. Zinc oxide varistors are ceramic devices made by sintering ZnO powder together with small amounts of other additives such as Bi2O3, MnO2, Co3O4 etc... The presence of Bi-ions trapped at the grain-boundaries are thought to be responsible for a highly nonlinear behavior. The nonlinear current-voltage (I-V) characteristics and excellent energy absorption capabilities, make ZnO...
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