Thermodynamics of Electrolytes on Anisotropic Lattices

Details Thermodynamics of Electrolytes on Anisotropic Lattices Thermodynamics of Electrolytes on Anisotropic Lattices

2003-07-18

arxiv.org/abs/cond-mat/0307472v1

Physics

Condensed Matter

Statistical Mechanics

submitted to PRE

Scientific paper

10.1103/PhysRevE.68.066110

The phase behavior of ionic fluids on simple cubic and tetragonal (anisotropic) lattices has been studied by grand canonical Monte Carlo simulations. Systems with both the true lattice Coulombic potential and continuous-space $1/r$ electrostatic interactions have been investigated. At all degrees of anisotropy, only coexistence between a disordered low-density phase and an ordered high-density phase with the structure similar to ionic crystal was found, in contrast to recent theoretical predictions. Tricritical parameters were determined to be monotonously increasing functions of anisotropy parameters which is consistent with theoretical calculations based on the Debye-H\"uckel approach. At large anisotropies a two-dimensional-like behavior is observed, from which we estimated the dimensionless tricritical temperature and density for the two-dimensional square lattice electrolyte to be $T^*_{tri}=0.14$ and $\rho^*_{tri} = 0.70$.

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