Researched on microstructure and density of sintered ZnO non-linear resistors

Systematic researched have been made of the grain growth and density of sintered ZnO-based systems containing one or more additive oxides of the type Bi
₂
O
₃
, MnO
₂
, and CoO. These samples were characterized using such techniques as scanning electron microscopy. The influence of the nature and amount of additive oxides and sintering temperature at 950 to 1350°C is discussed in relation to microstructure, breakdown voltage and the density present.