THERMODYNAMIC PROPERTIES OF SYNTHETIC OTAVITE, CDCO3(CR) - ENTHALPY INCREMENT MEASUREMENTS FROM 4.5-K TO 350-K

Enthalpy increments for cadmium carbonate were measured for temperatur es from 4.5 K to 350 K with an adiabatic calorimeter. These measuremen ts were used to compute the entropy, enthalpy relative to 0 K, and the heat capacity of cadmium carbonate. A small anomaly was observed for the sample in the temperature region from approximately 175 K to 265 K . Comparison of the calculated entropy for 298.15 K, 103.88 J . K-1. m ol(-1), is made with other previously published reference values to ar rive at a more precise and consistent set of thermodynamic properties for otavite.