Phase behavior of three-component ionic fluids
نویسندگان
چکیده
We study the phase behavior of solutions consisting of positive and negative ions of valence z to which a third ionic species of valence Z > z is added. Using a discretized Debye-Hückel theory, we analyze the phase behavior of such systems for different values of the ratio Z̄ ≡ Z/z. We find, for Z̄ > 1.934, a three-phase coexistence region and, for Z̄ > 2, a closed (reentrant) coexistence loop at high temperatures. We characterize the behavior of these ternary ionic mixtures as function of charge asymmetry and temperature, and show the complete phase diagrams for the experimentally relevant cases of Z̄ = 2 and Z̄ = 3, corresponding to addition of divalent and trivalent ions to monovalent ionic fluids, respectively. PACS. 61.20.Qg Structure of associated liquids: electrolytes, molten salts, etc. – 52.25.Kn Thermodynamics of plasmas – 05.20.-y Classical statistical mechanics
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