Low-temperature Heat Capacities and Enthalpy of Formation of Copper Oxysulfate.
Stuve-JM; Richardson-DW; King-EG
NTIS: PB 244 778 :18 pages
Low-temperature heat capacities and the enthalpy of formation were determined calorimetrically by the Bureau of Mines for cuo.Cuso4. The derived standard entropy (s deg 298.15) Was 40.36+/-0.04 Cal/deg- mole, and the enthalpy of formation (ah deg f) was -219.1+/-0.3 Kcal/g-mole. A large thermal anomaly was observed in the heat capacity of cuo.Cuso4 at 20+/-0.1 K. Gibbs energy of formation data are tabulated up to 1,200 k. Construction details of a precision low-temperature adiabatic calorimeter capable of determining heat capacities of solids in the temperature range 5 to 320 k are given. A calibrated miniature germanium resistance thermometer was incorporated into the calorimeter to extend the range of accurate measurements below 15 k. High-resistance DC heater windings were used throughout the cryostat to reduce heat conduction of inner connecting wires.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 244 778