Abstract
The effects of Dy 2O 3 on the microstructure and electrical properties of the SnO 2 based varistor system were investigated. It was found that Dy 2O 3 significantly affects the grain size and electrical properties of the SnO 2-based varistors. The sample with 1.00 mol% Dy 2O 3 has the best nonlinear electrical property and the highest nonlinear coefficient ( α = 26.3) among all samples. By SEM, TEM and EDS images, it was found dysprosium segregates at the grain boundary, which is responsible for “ p-type characteristics” of the grain boundaries. The reason that grain size decreases with increasing Dy 2O 3 concentration is given. The reason why the varistor sample has the excellent nonlinearity is explained.
Published Version
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