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Liquid polymorphism and density anomaly in a three-dimensional associating lattice gas

Mauricio Girardi, Aline L. Balladares, Vera B. Henriques, Marcia C. Barbosa

cond-mat.softarXiv:cond-mat/0612232

Abstract

We investigate the phase diagram of a three-dimensional associating gas (ALG) model. This model combines orientational ice-like interactions and ``van der Waals'' that might be repulsive, representing, in this case, a penalty for distortion of hydrogen bonds. These interactions can be interpreted as two competing distances making the connection between this model and continuous isotropic soft-core potentials. We present Monte Carlo studies of the ALG model showing the presence of two liquid phase, two critical points and A density anomaly.

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