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Low-temperature Heat Capacities and Entropies At 298.15 Deg. K of Geothite and Pyrophyllite.

Authors
King-EG; Weller-WW
Source
NTIS: PB 190 976 :6 pages
Link
NIOSHTIC No.
10008997
Abstract
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.
Publication Date
19700101
Document Type
IH; Report of Investigation;
Fiscal Year
1970
NTIS Accession No.
PB-190976
NTIS Price
A02
Identifying No.
RI 7369
NIOSH Division
ALRC;
Source Name
NTIS: PB 190 976
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