Thermal conductivity under pressure and through phase transitions in solid alkali halides. II. Theory

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Abstract
For pt.I see ibid., vol.18, p.3943 (1985). The results in the preceding paper concerning the variation of the thermal conductivity, lambda , of six potassium and rubidium halides with temperature and pressure are analysed using a Leibfried-Schlomann formulation for the phonon-phonon scattering. The concept of a reference thermal conductivity is introduced which demonstrates how lambda varies with both the mass ratio and the structure change through the B1 and B2 phase transition. The pressure variation of lambda is dependent on the first and second Gruneisen parameters. The large decrease in lambda at the phase transition is seen to be primarily due to the sudden increase in the first Gruneisen parameter as the coordinate number changes from 6 to 8.