Process for production for a varistor material.

摘要

A varistor material comprising two crystalline phases of ZnO and ZnMn2O4, wherein Zn and Mn are present at such a ratio that 3 to 7% by mol of MnO is contained per 100% by mol of ZnO + MnO, and the nonlinear index ( alpha ) of the varistor properties is at least 10; and a process for the production of the same, which comprises adding a manganese compound to ZnO at such a ratio as to give the above defined content of MnO, sintering the mixture at 1100 to 1350 DEG C, and further annealing the obtained sintered material at a temperature lower than the sintering temperature by at least 50 DEG C and higher than 1000 DEG C; are disclosed.