Preparation of zinc oxide varistor by a wet chemical method

A wet chemical method has been applied to synthesize zinc oxide varistor in order to obtain chemically pure and homogeneous product. Efficient yield was attained for precursors by a precipitation method using zinc acetate as a starting material with praseodymium oxide and cobalt chloride as additives. The calcination process, crystalline size of zinc oxide, additives distribution and voltage current curve were characterized for the samples, which were prepared by a wet chemical method with or without calcination, and by a ball-mill method for comparison.