• Microstructural and electrical characteristics of SiO2 doped ZnO-Bi2O3 varistors

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    • Keywords


      Varistors; nonlinear coefficient; sintering; grain sizes

    • Abstract


      Varistors in the new system ZnO-Bi2O3-SiO2 were prepared through conventional ceramic processing route. The effect of sintering temperature and time (0·5 h to 2 h between 1000° and 1250°C) on the microstructure and current/voltage characteristics of the varistors of the new system were investigated and the results were compared with those of ZnO-Bi2O3 system varistors prepared. An increase in nonlinear coefficient (α) value was observed in the SiO2 added varistors. The microstructure and the phase of the varistors were examined by means of SEM and XRD. The Zn2SiO4 spinel phase was found to be present in the intergranular region. The grain growth exponent was determined to be 2·5±0·2 and the activation energy for the ZnO grain growth was estimated to be 251±11 kJ/mol. These values were compared with those estimated for ZnO-Bi2O3 system varistors.

    • Author Affiliations


      R Goel1 A Sil1 H R Anand1

      1. School of Basic and Applied Sciences, Thapar Institute of Engineering and Technology, Patiala - 147 001, India
    • Dates

  • Bulletin of Materials Science | News

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