• Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • Keywords


      Sr𝑥Ba1−𝑥Fe0.6Sn0.4O3−𝜀; NTC thermistors; electrical properties.

    • Abstract


      Polycrystalline thermistor ceramics with the stoichiometric formula, Sr𝑥Ba1−𝑥Fe0.6Sn0.4O3−𝜀 (0.2 ≤ 𝑥 ≤ 0.8), had been prepared by a standard solid state reaction route. X-ray diffraction analysis indicates that the ceramic system remains cubic perovskite structure with a very small lattice change. The electrical properties of Sr𝑥Ba1−𝑥Fe0.6Sn0.4O3−𝜀 thermistors were studied using a digital thermometer over a wide range of 298–400 K. The thermistors showed an excellent negative temperature coefficient (NTC) thermistor behaviour. The values of resistivity at 298 K (ρ982), thermistor constant (𝐵298/358) and activation energy (𝐸a) of the Sr𝑥Ba1−𝑥Fe0.6Sn0.4O3−𝜀 thermistors, decreasing with the increase of Sr content, were in the range of 0.37–11.0 k𝛺.cm, 2466–3703 K and 0.212–0.319 eV, respectively. For the thermistors with the compositions 𝑥 = 0.2 and 0.4, the fitting equivalent circuit was composed of three RCPE elements corresponding to grain, grain boundary and ceramic–electrode interface, respectively. From the impedance plots, it was found that the fitting data showed good agreement with the experimental data. The extracted grain boundary resistance exhibited a NTC thermistor behaviour.

    • Author Affiliations


      C L Yuan1 2 X Y Liu1 2 J W Xu1 X W Zhang1 C R Zhou1

      1. School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China
      2. College of Materials Science and Engineering, Central South University, Changsha 410083, 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

© 2021-2022 Indian Academy of Sciences, Bengaluru.