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Advances in Applied Ceramics
Structural, Functional and Bioceramics
Volume 105, 2006 - Issue 3
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Short Communication

Effect of step sintering on breakdown voltage of varistors prepared from nanomaterials by sol gel route

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Pages 158-160 | Published online: 29 Nov 2013
 

Abstract

ZnO varistor materials were prepared by a sol gel route with subsequent drying and calcination. Varistor discs fabricated from these materials were subjected to a two step sintering schedule. Therefore in a typical experiment, the samples were heated to 1000°C, then allowed to cool for over 30 min to 900°C and held there for 6 h. The results were compared with commercial varistor samples sintered in a similar way. Considerably higher breakdown voltages were obtained for the varistors made from nanosample (1192±30 V mm−1) compared with the commercial samples (723±30 V mm−1) sintered under the same experimental conditions. The sintered materials were characterised by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and density measurements.

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