Materials Transactions Online

Materials Transactions, Vol.41 No.9 (2000) pp.1226-1231
© 2000 The Japan Institute of Metals

ZnO Varistors Prepared by Direct Mixing of Constituent Phases

Zorica Brankovi´c1, Olivera Miloševi´c1, Dejan Poleti2, Ljiljana Karanovi´c3 and Dragan Uskokovi´c1

1Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Knez-Mihailova 35/IV,
11000 Belgrade, Yugoslavia
2Department of General and Inorganic Chemistry, Faculty of Technology and Metallurgy, University of Belgrade,
P.O. Box 494, 11001 Belgrade, Yugoslavia
3Laboratory of Crystallography, Faculty of Mining and Geology, University of Belgrade, Djušina 7,
11000 Belgrade, Yugoslavia

ZnO varistors with non-linearity coefficients reaching 50 and low values of the leakage current (∼0.01 A/m2), were obtained by a method referred to as ``direct mixing of constituent phases''. The method is based on sintering of a mixture of the constituent phases with the following compositions: ZnO phase uniformly doped with Co2+ and Mn2+; intergranular phase: γ-Bi2O3 stabilized with Mn2+ or Zn2+; spinel phase: Zn1.971Ni0.090Co0.030Cr0.247Mn0.090Sb0.545O4. As proved, the obtained varistors are composed of the same phases as those introduced into the system. The influence of composition as well as milling and sintering parameters on the varistor characteristics were investigated. Some varistor powder mixtures were intensively milled before sintering. As a result, high density ceramics with higly homogeneous microstructure were obtained after sintering.

(Received December 28, 1999; Accepted June 12, 2000)

Keywords: ZnO, varistors, phases, microstructure, electrical properties

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