The steam-water-ice system: a two-dimensional bonded lattice model. The first-order approximation

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Abstract
The model studied consists of a two-dimensional triangular lattice of which some sites are occupied by the centres of molecules, the remainder being unoccupied. The calculations of Bell and Lavis, using a first order approximation based on a triangle of sites, transitions are obtained, one of a vapour-liquid type and another of a liquid-solid type, the solid being less dense than the liquid. It is thus possible to obtain a complete phase diagram for vapour, liquid and one solid phase. The close-packed state is shown to be the low temperature form of the liquid phase.

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