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

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

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    17 Citations (Scopus)

    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 1000uC, then allowed to cool for over 30 min to 900uC 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 varistorsmade from nanosample (1192¡30 V mm21) compared with the commercial samples (723 ¡30 V mm21) 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.
    Original languageEnglish
    Pages (from-to)158-160
    JournalAdvances in Applied Ceramics
    Volume105
    Issue number3
    DOIs
    Publication statusPublished - 2006

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