Ab initiocalculation of the thermodynamic properties and atomic temperature factors ofα-quartz and stishovite
- 1 April 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 51 (13), 8610-8613
- https://doi.org/10.1103/physrevb.51.8610
Abstract
The constant-volume specific heat, the entropy, the phonon contributions to internal energy and Helmholtz free energy, and the atomic temperature factors of α-quartz and stishovite, two allotropic forms of , are calculated as a function of temperature from ab initio phonon band structures. Available experimental data agree with our calculated values over a wide range of temperature. α-quartz has more accessible phonon states at low temperatures, while stishovite has larger contributions to the thermodynamic functions from the zero-point motion.
Keywords
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