Density Anomaly in Core-Softened Lattice Gas

TL;DR

This paper investigates a 2D lattice gas model with core-softened potential, revealing two liquid phases, a density anomaly, and a complex phase transition structure involving a tricritical point and a critical line.

Contribution

It introduces a novel lattice gas model exhibiting density anomaly and detailed phase transition behavior with a tricritical point.

Findings

Identification of two liquid phases and density anomaly

Demixing phase transition ends at a tricritical point

Density anomaly linked to a continuous critical line

Abstract

A two dimensional lattice gas model with ''core-softened'' potential is investigated. Two liquid phases and density anomaly are found. The demixing phase transition between the two liquid phases end at a tricritical point that is also the terminus of a critical line. The density anomaly is related to this continuous line.