Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-03-13
J. Chem. Phys. 115, 2702 (2001)
Physics
Condensed Matter
Statistical Mechanics
10 pages 6 figures
Scientific paper
10.1063/1.1383796
We study a model for an argon-like fluid parameterised in terms of a hard-core repulsion and a two-Yukawa potential. The liquid-gas phase behaviour of the model is obtained from the thermodynamically self-consistent Ornstein-Zernike approximation (SCOZA) of Hoye and Stell, the solution of which lends itself particularly well to a pair potential of this form. The predictions for the critical point and the coexistence curve are compared to new high resolution simulation data and to other liquid-state theories, including the hierarchical reference theory (HRT) of Parola and Reatto. Both SCOZA and HRT deliver results that are considerably more accurate than standard integral-equation approaches. Among the versions of SCOZA considered, the one yielding the best agreement with simulation successfully predicts the critical point parameters to within 1%.
Pini Davide
Stell George
Wilding Nigel B.
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