National Technical Reports Library

Details

Low-Temperature Heat Capacities and High-Temperature Enthalpies of Cuprous and Cupric Sulfides.

PB288240

Publication Date	1978
Personal Author	Ferrante, M. J.; Stuve, J. M.; Daut, G. E.; Pankratz, L. B.
Page Count	28
Abstract	Low-temperature heat capacities and high-temperature enthalpies for synthetic Cu2S and CuS were measured. Heat capacities were measured with an adiabatic calorimeter from 5 to 310 K, and resulted in standard entropies at 298.15 K of 27.76 for Cu2S(c) and 16.05 cal/deg mole for CuS(c). Low-temperature values are tabulated for the standard heat capacity, entropy, Gibbs energy function, and enthalpy relative to 0 K. Enthalpies were measured with a copper-block calorimeter from 298.15 to 1,600 K for Cu2S(c,1) and 298.15 to 780 K for CuS(c). The thermal behavior of CuS showed no transitions or other significant anomalies for the low-or high-temperature investigations. Cu2S showed reversible transitions at 376 K with an isothermal heat absorption of 0.865 kcal/mole, 720 K with an isothermal absorption of 0.280 kcal/mole, and approximately 1,400 K with a heat of fusion of 3.070 kcal/mole. High-temperature data are tabulated for the standard heat capacity, entropy, Gibbs energy function, and enthalpy relative to 298.15 K. Enthalpies are also expressed in equation form. The low- and high-temperature data were combined with data from the literature to calculate and tabulate the standard enthalpy and Gibbs energy of formations.
Keywords	Specific heat Enthalpy Thermodynamic properties Entropy Gibbs free energy Inorganic sulfides Copper sulfides
Source Agency	Bureau of Mines
NTIS Subject Category	99F - Physical & Theoretical Chemistry
Corporate Authors	Bureau of Mines, Albany, OR. Albany Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations (Final).
NTIS Issue Number	197905

Low-Temperature Heat Capacities and High-Temperature Enthalpies of Cuprous and Cupric Sulfides.

Low-Temperature Heat Capacities and High-Temperature Enthalpies of Cuprous and Cupric Sulfides.
PB288240

Publication Date	1978
Personal Author	Ferrante, M. J.; Stuve, J. M.; Daut, G. E.; Pankratz, L. B.
Page Count	28
Abstract	Low-temperature heat capacities and high-temperature enthalpies for synthetic Cu2S and CuS were measured. Heat capacities were measured with an adiabatic calorimeter from 5 to 310 K, and resulted in standard entropies at 298.15 K of 27.76 for Cu2S(c) and 16.05 cal/deg mole for CuS(c). Low-temperature values are tabulated for the standard heat capacity, entropy, Gibbs energy function, and enthalpy relative to 0 K. Enthalpies were measured with a copper-block calorimeter from 298.15 to 1,600 K for Cu2S(c,1) and 298.15 to 780 K for CuS(c). The thermal behavior of CuS showed no transitions or other significant anomalies for the low-or high-temperature investigations. Cu2S showed reversible transitions at 376 K with an isothermal heat absorption of 0.865 kcal/mole, 720 K with an isothermal absorption of 0.280 kcal/mole, and approximately 1,400 K with a heat of fusion of 3.070 kcal/mole. High-temperature data are tabulated for the standard heat capacity, entropy, Gibbs energy function, and enthalpy relative to 298.15 K. Enthalpies are also expressed in equation form. The low- and high-temperature data were combined with data from the literature to calculate and tabulate the standard enthalpy and Gibbs energy of formations.
Keywords	Specific heat Enthalpy Thermodynamic properties Entropy Gibbs free energy Inorganic sulfides Copper sulfides
Source Agency	Bureau of Mines
NTIS Subject Category	99F - Physical & Theoretical Chemistry
Corporate Authors	Bureau of Mines, Albany, OR. Albany Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations (Final).
NTIS Issue Number	197905