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
November 1, 1976
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.
Citation Information
| Publication Year | 1976 |
|---|---|
| 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 |
| Authors | Richard A. Robie, Bruce S. Hemingway, William H. Wilson |
| Publication Type | Article |
| Publication Subtype | Journal Article |
| Series Title | Journal of Research of the U.S. Geological Survey |
| Index ID | 70233426 |
| Record Source | USGS Publications Warehouse |