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Thermoelastic behaviour of mixed ammonium halides

Czechoslovak Journal of Physics, ISSN: 0011-4626, Vol: 42, Issue: 4, Page: 431-437
1992
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Article Description

A theory for the temperature derivatives of second order elastic constants of ammonium chloride and ammonium bromide, crystalizing in ceasium chloride structure has been developed incorporating contributions due to the thermal phonons and three body interactions in the lattice energy in the framework of Hildebrand approximation. The expressions for the temperature derivatives have been derived by differentiating the expressions of the second order elastic constants. The repulsive potential which is taken to be of the Born-Mayer type is assumed significant up to the first neighbours only. Computations have been made for pure and mixed crystals NHClBr for x=0, 0.13, 0.23 and 1.00. The results have been found in agreement with the experimental data wherever these are available. © 1992 Institute of Physics, Czechoslovak Academy of Sciences.

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