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

Abstract

: This paper describes a joint correlation analysis of the heat capacity C_p(T) and volume thermal expansivity β(T) of potassium chloride (KCl) over the entire temperature range of its solid state (from absolute zero to T_m). A trilinear model for the β(C_p) correlation dependence, consistent with experimental data and consisting of three smoothly joined linear segments, has been constructed. The differential Grüneisen parameter γ ' ~ ∂β/∂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.