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Temperature and pressure effects on the thermal conductivity and heat capacity of CsCl, CsBr and CsI

The thermal conductivity and the heat capacity per unit volume of CsCl, CsBr and CsI have been measured as a function of temperature and pressure over the ranges 100-400K and 0-2.5 GPa. For CsCl and CsBr most of the contribution to the thermal conductivity comes from acoustical phonons, while in the case of CsI there is an appreciable contribution from optical phonons. The part of the thermal conductivity due to propagating acoustic phonons has essentially a T-1 temperature dependence. The heat capacity is found to be essentially constant over the measured temperature and pressure range for all three materials. The pressure dependence of the Gruneisen constant, derived from the change in the thermal conductivity under pressure, is correlated with the same quantity obtained by other methods, and the reasons for the discrepancies are discussed.