The Molar Heats of Lead Sulphide, Selenide and Telluride in the Temperature Range 20 K to 260 K

An apparatus suitable for calorimetry at low temperatures is described. With it, the molar heats of lead sulphide, selenide and telluride have been measured between 20°K and 260°K. These salts show a normal family of molar heat curves, from which the usual thermodynamic functions have been calculated. An analysis of corrections required with the method of calorimetry used, is given in an Appendix.