Abstract
The novel CuO-doped dense tin oxide varistor ceramics are investigated.The densification of tin oxide varistor ceramics could be greatlyimproved by doping copper oxide additives. The introduction of antimonyadditives into a SnO2.CuO ceramic system would make it possessexcellent nonlinearity. The sample doped with 0.05 mol%Sb2O3 possesses the highest nonlinearity coefficient(α = 17.9) and the lowest leakage current density (JL = 52 μAcm−2) among all the samples. A modified defect barrier model isintroduced to explain the formation of the grain-boundary barrier. Thenonlinear behaviour of (Cu, Sb)-doped SnO2 varistor system couldbe explained by the barrier model.
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