Phase Diagram of a Two-Dimensional Lattice Gas Model of a Ramp System Articles uri icon

publication date

  • September 2009

issue

  • 12

volume

  • 131

international standard serial number (ISSN)

  • 0021-9606

electronic international standard serial number (EISSN)

  • 1089-7690

abstract

  • Using Monte Carlo simulation and fundamental measure theory we study the phase diagram of a two-dimensional lattice gas model with a nearest neighbor hard core exclusion and a next-to-nearest neighbor finite repulsive interaction. The model presents two competing ranges of interaction and, in common with many experimental systems, exhibits a low density solid phase, which melts back to the fluid phase upon compression. The theoretical approach is found to provide a qualitatively correct picture of the phase diagram of our model system