Monte Carlo calculations of the free energy of ice-like structures using the self-referential method

Alexander Atamas, Marina V. Koudriachova, Simon W. de Leeuw, Martin B. Sweatman

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The self-referential method is a recently developed technique to compute the free energy of molecular crystals. In this paper, the method is extended to systems composed of nonlinear rigid molecules and applied to obtain the Helmholtz free energy of ice VII, hexagonal ice, cubic ice, and the Gibbs free energy of the empty structure I (sI) clathrate hydrate and fully occupied methane sI. It is shown that the method provides a viable alternative to other techniques to determine the free energy of solids. Good agreement with available reference literature data is found. We expect that the technique can be applied to a wide range of molecular crystals.

Original languageUndefined/Unknown
Pages (from-to)284-292
Number of pages9
JournalMolecular simulation
Issue number4
Publication statusPublished - 2011


  • phase equilibria
  • computer simulations
  • free energy
  • molecular simulations
  • Monte Carlo
  • crystalline solids
  • clathrate

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