• Temperature dependence of dielectric constant of crystals with fluorite structure

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      https://www.ias.ac.in/article/fulltext/pram/022/06/0559-0565

    • Keywords

       

      Dielectric constant; fluorite-type crystals; strain derivative; polarizability

    • Abstract

       

      The experimental data on the temperature variation of dielectric constant of six crystals with fluorite structure are analysed using an approach proposed by Havinga and Bosman for ionic crystals. The temperature variation of dielectric constant is resolved in three components related to the thermal expansion, the pressure dependence of dielectric constant and the temperature variation of polarizability (theA, B, C terms). In the present work, theB term is calculated semiempirically, such that the analysis can be extended to crystals like EuF2 for which high pressure dielectric constant data are not available. For the first time, such calculations have been made for EuF2 and PbF2 at elevated temperatures. TheC term, which is related to the temperature variation ofir polarizability is seen to play a dominant role in determining the temperature variation of dielectric constant.

    • Author Affiliations

       

      Lalitha Sirdeshmukh1 Y R Reddy1

      1. Physics Department, Kakatiya University, Warangal - 506 009, India
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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