Thermodynamics of open networks: Ordering and entropy in NaAlSiO4 glass, liquid, and polymorphs
Physics and Chemistry of Minerals
By: P. Richet, R. A. Robie, J. Rogez, B. S. Hemingway, P. Courtial, and C. Tequi
Links
- More information: Publisher Index Page (via DOI)
- Download citation as: RIS | Dublin Core
Abstract
The thermodynamic properties of carnegieite and NaAlSiO4 glass and liquid have been investigated through Cp determinations from 10 to 1800 K and solution-calorimetry measurements. The relative entropies S298-S0 of carnegieite and NaAlSiO4 glass are 118.7 and 124.8 J/mol K, respectively. The low-high carnegieite transition has been observed at 966 K with an enthalpy of transition of 8.1??0.3 kJ/mol, and the enthalpy of fusion of carnegieite at the congruent melting point of 1799 K is 21.7??3 kJ/mol. These results are consistent with the reported temperature of the nepheline-carnegieite transition and available thermodynamic data for nepheline. The entropy of quenched NaAlSiO4 glass at 0 K is 9.7??2 J/mol K and indicates considerable ordering among AlO4 and SiO4 tetrahedra. In the liquid state, progressive, temperature-induced Si, Al disordering could account for the high configurational heat capacity. Finally, the differences between the entropies and heat capacities of nepheline and carnegieite do not seem to conform to current polyhedral modeling of these properties ?? 1990 Springer-Verlag.
Suggested Citation
Richet, P., Robie, R.A., Rogez, J., Hemingway, B.S., Courtial, P., Tequi, C., 1990, Thermodynamics of open networks: Ordering and entropy in NaAlSiO4 glass, liquid, and polymorphs: Physics and Chemistry of Minerals, v. 17, no. 5, p. 385-394, https://doi.org/10.1007/BF00212206.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Thermodynamics of open networks: Ordering and entropy in NaAlSiO4 glass, liquid, and polymorphs |
| Series title | Physics and Chemistry of Minerals |
| DOI | 10.1007/BF00212206 |
| Volume | 17 |
| Issue | 5 |
| Year Published | 1990 |
| Language | English |
| Publisher location | Springer-Verlag |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Physics and Chemistry of Minerals |
| First page | 385 |
| Last page | 394 |