High-temperature heat capacities of corundum, periclase, anorthite, CaAl/sub 2/Si/sub 2/O/sub 8/ glass, muscovite, pyrophyllite, KAlSi/sub 3/O/sub 8/ glass, grossular, and NaAlSi/sub 3/O/sub 8/ glass

Journal Article · Mon Jan 01 04:00:00 EST 1979 · Am. Mineral.; (United States)

OSTI ID:6046185

Krupka, K M; Robie, R A; Hemingway, B S

The heat capacities (C/sup 0//sub p/) of corundum, periclase, anorthite, CaAl/sub 2/Si/sub 2/O/sub 8/ glass, muscovite, pyrophyllite, KAlSi/sub 3/O/sub 8/ glass, grossular, and NaAlSi/sub 3/O/sub 8/ glass have been determined to an accuracy of +-1.0% by differential scanning calorimetry between 350 and 1000 K. Results have been combined smoothly with existing low-temperature heat capacity and entropy data, and fitted by least squares to the equations presented. The accuracy of the differential scanning calorimeter was checked by measuring the heat capacities of corundum and periclase and comparing these results with those published by the U.S. National Bureau of Standards. Calorimetric data for muscovite, pyrophyllite, and grossular were combined with data from recent equilibrium studies to derive improved values for ..delta..H/sup 0//sub f,298/ and ..delta..G/sup 0//sub f,298/ for muscovite, pyrophyllite, and grossular.

• Research Organization: Geological Survey, Reston, VA
• OSTI ID: 6046185
• Journal Information: Am. Mineral.; (United States), Journal Name: Am. Mineral.; (United States) Vol. 64:1-2; ISSN AMMIA
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
152002* -- Geothermal Data & Theory-- Properties of Minerals & Rocks
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ALUMINIUM SILICATES
ANORTHOSITES
CALCIUM COMPOUNDS
CALCIUM SILICATES
CHALCOGENIDES
CORUNDUM
GLASS
IGNEOUS ROCKS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICA
MINERALS
MUSCOVITE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PYROPHYLLITE
ROCKS
SILICATES
SILICON COMPOUNDS
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES