Finite Lattice and Phenomenological Approximations for the Anomaly in the Density of a Water-like Lattice Gas Model

Details Finite Lattice and Phenomenological Approximations for the Anomaly in the Density of a Water-like Lattice Gas Model Finite Lattice and Phenomenological Approximations for the Anomaly in the Density of a Water-like Lattice Gas Model

2011-11-18

arxiv.org/abs/1111.4331v1

Physics

Condensed Matter

Statistical Mechanics

17 pages, 7 figures

Scientific paper

We propose a model for a two dimensional, associative water-like lattice gas with one single variable representing both long and short-range interactions. The corresponding hamiltonian was solved exactly, by state enumeration in a finite lattice, so to obtain an analytic expression for the partition function. The lattice dimensions were chosen based on geometric characteristics of the stable phases found in previous works using Monte Carlo simulations. An expression for the particle density in the finite lattice was then obtained, and coexistence curves with a region of anomaly in the density presented in a phase diagram. In the end, a phenomenological theory for the system density is proposed and compared to the previous results.

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