Fluid-fluid demixing and density anomaly in a ternary mixture of hard spheres

Physical Review. E
Nathann T Rodrigues, Tiago J Oliveira

Abstract

We report the grand-canonical solution of a ternary mixture of discrete hard spheres defined on a Husimi lattice built with cubes, which provides a mean-field approximation for this system on the cubic lattice. The mixture is composed of pointlike particles (0NN) and particles which exclude up to their first (1NN) and second neighbors (2NN), with activities z_{0}, z_{1}, and z_{2}, respectively. Our solution reveals a very rich thermodynamic behavior, with two solid phases associated with the ordering of 1NN (S1) or 2NN particles (S2), and two fluid phases, one being regular (RF) and the other characterized by a dominance of 0NN particles (F0 phase). However, in most part of the phase diagram these fluid (F) phases are indistinguishable. Discontinuous transitions are observed between all the four phases, yielding several coexistence surfaces in the system, among which a fluid-fluid and a solid-solid demixing surface. The former one is limited by a line of critical points and a line of triple points (where the phases RF-F0-S2 coexist), both meeting at a special point, after which the fluid-fluid coexistence becomes metastable. Another line of triple points is found, connecting the F-S1, F-S2, and S1-S2 coexistence surfaces. A cr...Continue Reading

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Citations

Apr 18, 2021·Physical Review. E·Nathann T Rodrigues, Tiago J Oliveira

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