Thermodynamics and structure of the primitive model near its gas-liquid transition

The hypernetted-chain/mean spherical approximation (HNC/MSA) is employed to calculate the thermodynamic properties of the restricted primitive model (symmetric binary mixture of charged hard spheres) in the low density-high coupling region, where the gas-liquid phase transition is located. The spinodal curve is calculated from the virial and the compressibility equations. The HNC/MSA total correlation function does not show long-range behavior as the spinodal curve is approached. This is due to the hybrid nature of this approximation. However, a consistent HNC/MSA total correlation function is defined which does show the expected long-range behavior. This long-range behavior is found to be related to the phenomenon of ionic clustering, in accordance with previous studies. © 1991 American Institute of Physics.

Binary mixtures; Thermodynamic properties; Thermodynamics; Charged hard spheres; Compressibility equations; Correlation function; Gas-liquid phase transitions; Hypernetted chain/mean spherical approximations; Primitive model; Restricted primitive model; Spinodal curves; Phase transitions

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