Heat capacities of Calorimetry Conference copper and of muscovite KAl/sub 2/(AlSi/sub 3/)O/sub 10/(OH)/sub 2/, pyrophyllite Al/sub 2/Si/sub 4/O/sub 10/(OH)/sub 2/, and illite K/sub 3/(Al/sub 7/Mg(Si/sub 14/Al/sub 2/)O/sub 40/(OH)/sub 8/ between 15 and 375/sup 0/K and their standard entropies at 298. 15/sup 0/K

Journal Article · Thu Jan 01 00:00:00 EST 1976 · J. Res. U.S. Geol. Surv.; (United States)

OSTI ID:6530675

Robie, R A; Hemingway, B S; Wilson, W H

The heat capacities of Calorimetry Conference copper and of muscovite, pyrophyllite, and illite were measured between 15 and 375/sup 0/K using an adiabatic calorimeter. Tables of the thermodynamic functions C/sup 0//sub p/, (H/sup 0//sub T/--H/sub 0//sup 0/)/T, (G/sup 0//sub T/--H/sub 0//sup 0/)/T, and S/sup 0//sub T/--S/sub 0//sup 0/ are presented for these phases at integral temperatures from 0 to 30/sup 0/K. At 298.15/sup 0/K (25.0/sup 0/C), S/sup 0//sub T/--S/sub 0//sup 0/ is 33.12 +- 0.06, 287.7 +- 0.6, 239.4 +- 0.4, and 1,104.2 +- 0.6 J/(mol.K) for copper, muscovite, pyrophyllite, and illite, respectively. The operation of a semiautomatic data-acquisition system for calorimetric measurements at low temperatures is also described, together with a description of a miniature calorimeter having a novel closure seal.

• OSTI ID: 6530675
• Journal Information: J. Res. U.S. Geol. Surv.; (United States), Vol. 4:6
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
COPPER
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
ILLITE
MUSCOVITE
PYROPHYLLITE
CALORIMETERS
DATA ACQUISITION SYSTEMS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CLAYS
ELEMENTS
MEASURING INSTRUMENTS
METALS
MICA
MINERALS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENTS
152002* - Geothermal Data & Theory- Properties of Minerals & Rocks