The Effects of SnO2 Doping on the Electrical Properties of ZnO Varistors

The SnO2 doping can increase the nonlinear coefficients of ZnO varistors, the highest α value is achieved at the 0.75 wt% doping level samples sintered at 1150oC. The improved I-V nonlinearity may be attributed to the donor behavior of Sn4+ ions. The SnO2 doping can enhance the ZnO grain growth that lower the breakdown field of doped samples.