Joint Analysis of the Heat Capacity and Thermal Expansion of Solid Potassium Chloride

This paper describes a joint correlation analysis of the heat capacityC(p)(T) and volume thermal expansivity beta(T) of potassium chloride (KCl) over the entire temperature range of its solid state (from absolute zero toT(m)). A trilinear model for the beta(C-p) correlation dependence, consistent with experimental data and consisting of three smoothly joined linear segments, has been constructed. The differential Gruneisen parameter gamma ' similar to partial derivative beta/partial derivative C-p, convenient for describing such behavior, has three characteristic steps. Analysis of data in this model has made it possible to tabulate thermodynamic and thermal expansion data for solid KCl, in good agreement with the most reliable experimental data.