Liquid Polymorphism and Density Anomaly in a Lattice Gas Model

Details Liquid Polymorphism and Density Anomaly in a Lattice Gas Model Liquid Polymorphism and Density Anomaly in a Lattice Gas Model

2004-07-29

arxiv.org/abs/cond-mat/0407763v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevE.71.031504

We present a simple model for an associating liquid in which polymorphism and density anomaly are connected. Our model combines a two dimensional lattice gas with particles interacting through a soft core potential and orientational degrees of freedom represented through thermal \char`\"{}ice variables\char`\"{} . The competition between the directional attractive forces and the soft core potential leads to a phase diagram in which two liquid phases and a density anomaly are present. The coexistence line between the low density liquid and the high density liquid has a positive slope contradicting the surmise that the presence of a density anomaly implies that the high density liquid is more entropic than the low density liquid.

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