Phase diagrams in the lattice RPM model: from order-disorder to gas-liquid phase transition

Abstract

The phase behavior of the lattice restricted primitive model (RPM) for ionic systems with additional short-range nearest neighbor (nn) repulsive interactions has been studied by grand canonical Monte Carlo simulations. We obtain a rich phase behavior as the nn strength is varied. In particular, the phase diagram is very similar to the continuum RPM model for high nn strength. Specifically, we have found both gas-liquid phase separation, with associated Ising critical point, and first-order liquid-solid transition. We discuss how the line of continuous order-disorder transitions present for the low nn strength changes into the continuum-space behavior as one increases the nn strength and compare our findings with recent theoretical results by Ciach and Stell [Phys. Rev. Lett. {\bf 91}, 060601 (2003)].

arXiv comment7 pages, 10 figures

References in corpus (7)

• Universality class of criticality in the restricted primitive model electrolyte
• Coexistence and Criticality in Size-Asymmetric Hard-Core Electrolytes
• Critical behavior of the restricted primitive model revisited
• Lattice Models of Ionic Systems
• Discretization Dependence of Criticality in Model Fluids: a Hard-core Electrolyte
• Ionic criticality : an exactly soluble model
• Thermodynamics of Electrolytes on Anisotropic Lattices

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• Phase diagram of a bulk 1d lattice Coulomb gas
• Phase behavior of the Lattice Restricted Primitive Model with nearest-neighbor exclusion
• Machine-Learned Many-Body Potentials for Charged Colloids reveal Gas-Liquid Spinodal Instabilities only in the strong-coupling regime of Primitive Models