Effect of SnO₂ Addition on Electrical Degradation Characteristics of ZnO Varistors

Influence of SnO2 on ZnO–Bi2O3–Co2O3 based varistor ceramics

“…Furthermore, it is reported that in Bi 2 O 3 -MnO 2 -Co 3 O 4 added ZnO varistors. Spinel particles began to appear by the addition of SnO 2 over approximately 0.5 mol% and varistor voltage increased with increasing the amount of SnO 2 [13].…”