• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/043/0097

    • Keywords

       

      Varistors; electroceramics; dielectric properties.

    • Abstract

       

      This work presents Bi$_2$O$_3$-doped SnO$_2$ ceramic varistors prepared through conventional ceramic processing in the sintering temperature range of 1290–1320$^{\circ}$C. The sample sintered at 1300$^{\circ}$C exhibits a breakdown electric field as low as 11.6 V mm$^{−1}$. Scanning electron microscopy images reveal that all the samples have a compact structure, andenergy dispersive spectroscopy results for the sample sintered at 1300$^{\circ}$C indicate that Bi distributes homogeneously along the grain boundaries and aggregates inhomogeneously on the grain surfaces. With increasing sintering temperature, the grain boundary barrier height remains nearly constant at 0.80 eV. In both the dielectric loss and electric modulus spectra of the sample sintered at 1300$^{\circ}$C, obvious relaxations were observed and the activation energies obtained from the respectivespectra were 0.33 and 0.15 eV, which are expected to be related to oxygen vacancies and interstitial ions, respectively. Complex impedance spectra are employed to develop a non-typical equivalent circuit model for the Bi$_2$O$_3$-doped SnO$_2$ ceramic varistors at low voltage that yields an excellent fit to the data.

    • Author Affiliations

       

      GUO-ZHONG ZANG1 RUI-QING CHU2 ZHI-JUN XU2

      1. School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471003, People’s Republic of China
      2. School of Environmental and Material Engineering, Yantai University, Yantai 264005, People’s Republic of China
    • Dates

       
  • 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

© 2017-2019 Indian Academy of Sciences, Bengaluru.