Preparation of Ultrahigh Potential Gradient of ZnO Varistors by Rare-Earth Doping and Low-Temperature Sintering

Table 1

Relative density of samples with different doping concentrations and sintering temperatures.

Groups	Doping concentration of Y2O3 (mol%)	Sintering temperature (°C)	Relative density (%)
Sample 1	0.00	1200	96.37
Sample 2	0.08	1200	96.31
Sample 3	0.00	800	98.70
Sample 4	0.08	800	98.03