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

Authors: Pillai, S. C.; Kelly, J. M.; McCormack, D. E.; Ramesh, R.

Source: Advances in Applied Ceramics, Volume 105, Number 3, June 2006 , pp. 158-160(3)

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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.

Keywords: DOPANTS; SINTERING; ZNO; GRAIN GROWTH; NANO; VARISTORS

Document Type: Short Communication

DOI: http://dx.doi.org/10.1179/174367606X110189

Publication date: 2006-06-01

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