Toward an anisotropic atom-atom model for the crystalline phases of the molecular S8 compound

Details Toward an anisotropic atom-atom model for the crystalline phases of the molecular S8 compound Toward an anisotropic atom-atom model for the crystalline phases of the molecular S8 compound

2000-07-04

arxiv.org/abs/cond-mat/0007059v2

Physics

Condensed Matter

Soft Condensed Matter

Major changes, new simulations and figures added, revtex4, to appear in J. Chem. Phys

Scientific paper

10.1063/1.1413974

We analize two anisotropic atom-atom models used to describe the crystalline alpha,beta and gamma phases of S8 crystals, the most stable compound of elemental sulfur in solid phases, at ambient pressure and T<=400 K. The calculations are performed via a series of classical molecular dynamics (MD) simulations, with flexible molecular models and using a constant pressure-constant temperature algorithm for the numerical simulations. All intramolecular modes that mix with lattice modes, and are therefore relevant on the onset of structural phase transitions, are taken into account. Comparisons with experimental data and previous results obtained with an isotropic atom-atom molecular model are also performed.

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