Low-temperature Heat Capacities and Entropies At 298.15 Deg. K of Geothite and Pyrophyllite.
NTIS: PB 190 976 :6 pages
Low-temperature heat capacity determinations of the minerals goethite and pyrophyllite were made in the temperature range from 51 deg. to 298 deg. K. The entropies at 298.15 Deg. K were evaluated as 14.43 +- 0.15 Cal/deg mole for goethite and 56.6 +- 0.5 Cal/deg mole for pyrophyllite. The entropies of formation from the constituent oxides are -4.4 +- 0.2 Cal/deg mole for geothite and - 12.3 +- 0.6 Cal/deg mole for pyrophyllite. The standard free energy of formation of geoethite from its oxides is ^c deg. 298.15 = 0.16 +- 0.20 Kcal/mole.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 190 976