The temperature dependence of the static dielectric constantReport as inadecuate




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Abstract : It is shown that in alkali halides the increase of the static dielectric constant ε with temperature is exclusively due to anharmonic effects. A simple formula is given which permits the calculation of ε at any temperature if we know : i the dielectric constant at room temperature and ii the thermal variation of bulk modulus and of the lattice parameter. Furthermore Flynn-s explanation for the high formation entropy per Schottky defect is discussed.

Keywords : alkali metal halides elastic moduli heat of formation permittivity temperature dependence static dielectric constant alkali halides anharmonic effects room temperature bulk modulus lattice parameter high formation entropy per Schottky defect





Author: P.A. Varotsos

Source: https://hal.archives-ouvertes.fr/



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