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- W2068446202 abstract "We report calculations of the phase diagram and spinodal decomposition line of a charged hard‐sphere fluid mixture constituted of two different cations, one anion and one neutral particle species. In the high‐density regime the model is suitable to mimic molten silicate and metal halides mixtures, as those forming a magmatic fluid; in the low‐density regime it can conveniently describe the properties of charged colloidal suspensions or micellar solutions. In this work the attention is focused mainly on the high‐density regime of the mixture, and phase stability conditions are determined through the knowledge of the Gibbs free energy of mixing, Gmix at constant pressure, as calculated in the mean spherical approximation. It turns out that the solubility of the neutral component in the ionic mixture depends substantially on the potential‐to‐kinetic‐energy ratio, that is, on the so‐called coupling strength or plasma parameter, and increases when this decreases. This result is rationalized by considering the different terms contributing to Gmix and, specifically, the confi‐gurational Coulombic internal energy term and entropic term. The fine balance between these two quantities is detailed and the onset of phase segregation discussed on these same bases. Such a representation also allows us to interpret why mixtures like those envisaged here are characterized by a phase diagram with an upper consolution point and why the critical temperature turns out to be an increasing function of the pressure. The implications of this last result seem interesting since, e.g., molten salt‐silicate mixtures and, therefore, presumably fused rocks or magmas, could segregate not only under cooling, but also at constant temperature as the result of pressure variations." @default.
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- W2068446202 date "1993-01-15" @default.
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- W2068446202 title "Phase stability of dense multicomponent charged and uncharged hard‐sphere fluid mixtures" @default.
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- W2068446202 doi "https://doi.org/10.1063/1.464274" @default.
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