Abstract
The influence of a Nb2O5 additive on the densification, microstructural morphology, and nonlinear electrical properties of the CuO‐doped SnO2‐based varistors was investigated. It was found that copper oxide significantly improves the densification of the SnO2 ceramics. The effects of Nb2O5 on tin dioxide varistors were analyzed by X‐ray diffraction, scanning electron microscopy, energy‐dispersive spectroscopy, and capacitance–voltage measurements, as well as impedance spectroscopy. Copper oxide segregates at the grain boundaries and precipitates at triple points, and niobium makes the tin dioxide grain semi‐conductive. The copper oxide intergranular insulating layer separates two semi‐conductive tin dioxide grains and forms the barriers. The reason for the nonlinearity of SnO2‐based ceramics was explained.
Published Version
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