The heat capacities of Calorimetry Conference copper and of muscovite KAl2(AlSi3)O10(OH)2, pyrophyllite Al2Si4O10(OH)2, and illite K3(Al7Mg)(Si14Al2)O40(OH)8 between 15 and 375 K and their standard entropies at 298.15 K
Journal of Research of the U.S. Geological Survey
By: Richard A. Robie, Bruce S. Hemingway, and William H. Wilson
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Abstract
The heat capacities of Calorimetry Conference copper and of muscovite, pyrophyllite, and illite were measured between 15 and 375 K using an adiabatic calorimeter. Tables of the thermodynamic functions C°p.(H°T —H°O)/T, (G°T —H°O)/T, and S°T —S°O are presented for these phases at integral temperatures from 0 to. 370 K. At 298.15 K (25.0°C), S°T —S°O 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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The heat capacities of Calorimetry Conference copper and of muscovite KAl2(AlSi3)O10 (OH)2, pyrophyllite Al2Si4O10(OH)2, and illite K3(Al7Mg)(Si14Al2)O40(OH)8 between 15 and 375 K and their standard entropies at 298.15 K |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 4 |
| Issue | 6 |
| Year Published | 1976 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 14 p. |
| First page | 631 |
| Last page | 644 |