Heat Capacities and Thermodynamic Properties of the Pyrrhotites FeS and Fe0.877S from 5 to 350°K

Autor:	F. Grłnvold, Chien Chou, E. F. Westrum
Rok vydání:	1959
Předmět:	Chemistry Enthalpy General Physics and Astronomy Thermodynamics Physical and Theoretical Chemistry
Zdroj:	The Journal of Chemical Physics. 30:528-531
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1729980
Popis:	Heat capacities were measured from 5 to 350°K for two pyrrhotites at the iron‐rich limit (Fe1.000S) and the sulfur‐rich limit (Fe0.877S) of the homogeneity range. The heat‐capacity curves follow the normal sigmoid shape with the exception of an upward trend for Fe1.000S above 300°K, and two small, broad humps for Fe0.877S near 8 and 30°K. From these data the entropy and enthalpy functions were calculated. At 298.15°K the values of Cp, S°–S0°, and (H°–H0°)/T are 12.08, 14.415, and 7.496 cal/mole °K, respectively, for Fe1.000S, and 11.92, 14.529, and 7.396 cal/mole °K for Fe0.877S. The values on FeS are lower by approximately 10% over the range 58 to 296°K than those previously reported in the literature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::701823e6d0ac6e8672ed0073a3cc66d7 https://doi.org/10.1063/1.1729980 Zobrazit plný text záznamu