Heat capacity and thermodynamic properties of anisotropic crystals:: PbI2, ZnCl2, and AsI3 at temperatures from 5 K to 350 K

Heat capacities of PbI2, ZnCl2, and AsI3 have been determined by adiabatic shield calorimetry from T = 5 K to T = 350 K. No anomalous regions were found in the heat capacity of PbI2 and ZnCl2. Two anomalous regions were found in the heat capacity of AsI3: one small sharp peak at T = 161 K, and the other, a broad region from about T = 225 K to T = 290 K. The thermodynamic properties have been evaluated and the values of molar heat capacity, entropy, and enthalpy at T = 298.15 K were found to be: [GRAPHICS] (C) 1998 Academic Press.