LATTICE DYNAMICS AND SPECIFIC HEAT OF CAESIUM CHLORIDE
Abstract
Lattice dynamics of caesium chloride has been worked out employing the shell model of Cowley et al, taking into account tho polarisabilities of both the ions. with the phonon branches at the fifty six representative points in the Brillouin zone the frequency distributions and the specific heats are' calculated and
a fair agreement is found between the infrared maxima predicted by the model and so the specific heats obtained from calorimetric data. However it is shown that the modified shell model put forward by Deo and Dayal are not consistent with the symmetry of the normal modes on the Lone boundary and also the agreement between the calculated and observed specific heats are not satisfactory in this model.
a fair agreement is found between the infrared maxima predicted by the model and so the specific heats obtained from calorimetric data. However it is shown that the modified shell model put forward by Deo and Dayal are not consistent with the symmetry of the normal modes on the Lone boundary and also the agreement between the calculated and observed specific heats are not satisfactory in this model.
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