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

Table 2

 𝐼_𝐿, 𝐸_1mA, and 𝛼 for the four samples.

Groups	𝐼𝐿 (μA)	𝐸1mA (V/mm)	𝛼
Sample 1	396	114.7	3.0
Sample 2	355	193.7	3.6
Sample 3	16.4	1626.1	13.8
Sample 4	9.1	2247.2	23.0