Phase diagram of random lattice gases in the annealed limit

Details Phase diagram of random lattice gases in the annealed limit Phase diagram of random lattice gases in the annealed limit

1998-09-02

arxiv.org/abs/cond-mat/9809051v2

J. Chem. Phys. 110, 1235 (1999)

Physics

Condensed Matter

Statistical Mechanics

Final version to be published in the Journal of Chemical Physics

Scientific paper

10.1063/1.478166

An analysis of the random lattice gas in the annealed limit is presented. The statistical mechanics of disordered lattice systems is briefly reviewed. For the case of the lattice gas with an arbitrary uniform interaction potential and random short-range interactions the annealed limit is discussed in detail. By identifying and extracting an entropy of mixing term, a correct physical expression for the pressure is explicitly given. As an application, the one-dimensional lattice gas with uniform long-range interactions and random short-range interactions satisfying a bimodal annealed probability distribution is discussed. The model is exactly solved and is shown to present interesting behavior in the presence of competition between interactions, such as the presence of three phase transitions at constant temperature and the occurrence of triple and quadruple points.

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