Extended Mie-Grüneisen theory applied toin the disordered fcc phase
- 1 October 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 52 (14), 9910-9916
- https://doi.org/10.1103/physrevb.52.9910
Abstract
The large difference between the interatomic forces within a molecule and the intermolecular forces allows the intermolecular contributions to thermodynamic properties to be treated by a simple pairwise central force theory when the molecules are freely rotating. This circumstance was utilized to compute the intermolecular contribution to the properties of the disordered phase. The anharmonicity was treated by an extension of Mie-Grüneisen theory in which the Grüneisen constant was replaced by a Grüneisen parameter calculated as a function of volume from the intermolecular potential. The equation of state, compressibility, and coefficient of thermal expansion, as well as the ratio of the constant pressure to constant-volume heat capacity were computed in the quasiharmonic approximation using the calculated Grüneisen parameter. The agreement with experiment was satisfactory on all counts.
Keywords
This publication has 17 references indexed in Scilit:
- Compressibility of C 60 between 150 and 335 K and up to 1 GPaEurophysics Letters, 1994
- C60 under pressure-bulk modulus and equation of stateZeitschrift für Physik B Condensed Matter, 1994
- Anisotropic C 60 -C 60 Intermolecula PotentialEurophysics Letters, 1994
- Point defects and thermal conductivity ofPhysical Review B, 1993
- Calculation of static, dynamic, and thermodynamic properties of solidPhysical Review B, 1993
- Compressibility, specific heat capacity, and Grüneisen parameter for C60/C70Solid State Communications, 1992
- Ground state and phase transitions in solidPhysical Review Letters, 1992
- Molecular properties of fullerene in the gas and solid phasesThe Journal of Physical Chemistry, 1992
- Compressibility of Solid C 60Science, 1991
- Effects of pressure and stress on C60 fullerite to 20 GPaNature, 1991