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SnO2-based varistors capable of withstanding surge current
Journal of the Ceramic Society of Japan
SnO2-based varistor material was fabricated by doping of CoO, Nb2O5, Cr2O3, and Y2O3 or Ho2O3. The microstructure, nonlinear I-V characteristic and surge current performances have been investigated. The average grain boundary voltage of the obtained materials is close to that of ZnO varistors. Similar to Cr 3+ , Y 3+ or Ho 3+ acts as the acceptor in the grain boundaries and the depletion layers. Moderate co-doping Y2O3 or Ho2O3 with Cr2O3 is helpful to improve the electrical performances and todoi:10.2109/jcersj2.117.851 fatcat:chr65k24zrc6laigl2ljrriery