Patent ID: 8535575

Claim:
A current-voltage non-linear resistor comprising: a sintered body of a mixture whose chief constituent is zinc oxide and including as auxiliary constituents at least Bi, Sb, Mn, Co and Ni, wherein an average grain size of said mixture is no more than 0.4 μm; and an average grain size of a zinc oxide grains in said sintered body is no more than 7.5 μm and a standard deviation based on a grain size distribution of zinc oxide grains in said sintered body is no more than 15% of said average grain size of said zinc oxide grains, wherein an average grain size of spinel grains whose chief constituent is Zn 7 Sb 2 O 12 in said sintered body is no more than 1 μm and a standard deviation based on a grain size distribution of spinel grains whose chief constituent is Zn 7 Sb 2 O 12 in said sintered body is no more than 40% of said average grain size of said spinel grains, and wherein said standard deviation based on said grain size distribution of said mixture is no more than 75% of said average grain size of said mixture.