• R Goel

      Articles written in Bulletin of Materials Science

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

      R Goel A Sil H R Anand

      More Details Abstract Fulltext PDF

      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.

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.