Chemical preparation and properties of high-field zinc oxide varistors
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Chemical preparation and properties of high-field zinc oxide varistors R. G. Dosch, B. A. Tuttle, and R. A. Brooks Sandia National Laboratories, P. O. Box 5800, Albuquerque, New Mexico 87185 (Received 21 October 1985; accepted 19 November 1985) Chemical preparation methods were developed for high-field ZnO varistors which used precipitation techniques to prepare precursor powders. Varistors were made by sintering uniaxially pressed pellets in the range of 675°-740 °C in air. Properties of these varistors included electric fields (E) in the 10-100 kV/cm range at current densities (/) of 5 A/cm 2 , nonlinearity coefficients (a) greater than 30 for 2.5
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