Temperature dependence of dielectric constant of crystals with fluorite structure |
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Authors: | Lalitha Sirdeshmukh Y R Reddy |
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Institution: | (1) Physics Department, Kakatiya University, 506 009 Warangal, India |
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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. |
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Keywords: | Dielectric constant fluorite-type crystals strain derivative polarizability |
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