Thermal expansion, heat capacity, and compressibility of solid CO2

Abstract

AbstractThe coefficients of thermal expansion (13 to 139 °K), heat capacity (2 to 20 °K), and velocity of longitudinal and transversal ultrasonic waves (88 to 190 °K) for solid CO2 have been determined along the solid‐vapour equilibrium line. Heat capacity of constant volume, adiabatic and isothermal compressibilities, the Grüneisen and Poisson coefficients were calculated using the above data. The contributions of various types of heat motion to heat capacity, thermal expansion and compressibility have been separated, and the parameters of isolated orientational defects in crystalline CO2 determined. The connection between the orientational defect parameters and the extent of non‐centricity of intermolecular interactions in solids is discussed.