• Lalitha Sirdeshmukh

      Articles written in Pramana – Journal of Physics

    • Temperature dependence of dielectric constant of crystals with fluorite structure

      Lalitha Sirdeshmukh Y R Reddy

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      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.

    • Dielectric properties of RbCl-RbBr mixed crystals

      G Sathaiah Lalitha Sirdeshmukh

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      A systematic measurement of dielectric constant and loss on RbCl-RbBr mixed crystals in various compositions has been carried out in the frequency range 100 Hz to 100 kHz and in the temperature range from room temperature to 320°C. From these measurements the static dielectric constant, the Szigeti charge, the conductivity and the activation energy for conduction are evaluated. All these properties show a nonlinear composition dependence. Semiempirical equations proposed earlier are employed to evaluate the dielectric constant as a function of composition. The validity of these relations is also discussed.

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