Coprecipitation preparation and voltage sensitive characteristics of doped ZnO varistor

A process of preparing ZnO voltage-sensitive ceramics doped with some oxides by coprecipitation was described in the paper. The thermal properties of ZnO nanometer powders and the current-voltage characteristics of the ceramics have been investigated. The results showed that the six-additive ZnO powders with hexagonal system were homogeneous grain size distribution in microstructure, the optimal reaction pH is 6.90±0.05, the temperature for calcining and sintering was at about 500 °C and 1100 °C, respectively. The powders were also examined by SEM, IR and XRD etc, and the effect of doping La₂O₃ on the electrical properties of ZnO varistor was investigated too. Project supported by the Nonferrous Metals Industry Corporation of China Synopsis of the first author Huang Kelong, professor, born in 1955, majoring in Solid State Chemistry & Functional Material Chemistry.