Effects of In₂O₃ doping and sintering temperature on the electrical properties of ZnO varistors

Abstract

ZnO varistors are prepared using the 0.1–0.3 mm ZnO powders. The effects of the sintering temperature, contents of In₂O₃ doping on the non-linear properties of ZnO varistors have been investigated. The results show that this kind of ZnO powder has a high sintering activity. It is suitable for making the low voltage varistors. The V_c decreases with the increase of sintered temperature, when the In₂O₃ content is fixed (0.98%, mass fraction), and increases with the increase of In₂O₃ contents when the temperature is steady.

Keywords

ZnO varistors / In₂O₃-doping / sintering temperature

References

[1] MatsuokaM. Nonohmic properties of zinc oxide ceramics. Jpn J Appl Phys, 1971, 10(6): 736-736

[2] AsokangT, IyengarG N K, NagabhushanaG R. Nonohmic behaviour of the ZnO-Nb₂O₅ system. J Mater Sci, 1987, 22(3): 1019-1019

[3] JinhoKim, ToshioKimura, TakashiYamaguchi. Sintering of zinc oxide doped with antimony oxide and bisumuth oxide. J Am Ceram Soc, 1989, 72(8): 1390-1390

[4] SongXiaolan, LiuFuyi, LiShengtao. Effect of sub-grainboundaries on the characteristics of ZnO varistor ceramics. Journal of Xian Jiaotong University, 1995, 29(3): 52-52(in Chinese)

[5] ZhouLingzhiMetallurgy of rare metal, 1988, Beijing, Metallurgical Industry Press: 64-64(in Chinese)

[6] ZhouLingzhiMetallurgy of rare metal, 1988, Beijing, Metallurgical Industry Press: 10-10(in Chinese)