Molecular-dynamics investigation of orientational freezing in solid
- 15 January 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 45 (4), 1889-1895
- https://doi.org/10.1103/physrevb.45.1889
Abstract
Constant-pressure molecular-dynamics calculations have been carried out to investigate the reorientational behavior of molecules in the solid phase. Under ambient conditions, an intermolecular potential based on pairwise-additive atom-atom interactions yields a stable fcc crystal in which the molecules are found to undergo rotational diffusion. On cooling to 200 K the molecules freeze into an orientational ordered structure with tetragonal symmetry. Although the presence of a phase transition just below room temperature agrees well with calorimetric, x-ray, and NMR data, the predicted low-temperature structure does not. Possible reasons for this are discussed. The orientational relaxation time and phonon density of states are calculated at several temperatures. The former is in fair agreement with NMR data.
Keywords
This publication has 27 references indexed in Scilit:
- Electronic States of K
x
C 60 : Insulating, Metallic, and Superconducting CharacterScience, 1991
- Structure of single-phase superconducting K3C60Nature, 1991
- Structure and bonding in alkali-metal-doped C60Nature, 1991
- Superconductivity at 28 K inPhysical Review Letters, 1991
- Superconductivity at 18 K in potassium-doped C60Nature, 1991
- Electronic structure of solid: Experiment and theoryPhysical Review Letters, 1991
- Solid C60: a new form of carbonNature, 1990
- The infrared and ultraviolet absorption spectra of laboratory-produced carbon dust: evidence for the presence of the C60 moleculeChemical Physics Letters, 1990
- Space, Stars, C 60 , and SootScience, 1988
- C60: BuckminsterfullereneNature, 1985