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| Home > Publications database > Experimental study and thermodynamic assessment of the reciprocal system Mg2+, Ca2+ // Cl−, SO42− |
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| Journal Article | FZJ-2026-02352 |
; ; ; ;
2026
Academic Press
London
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Please use a persistent id in citations: doi:10.1016/j.jct.2026.107681 doi:10.34734/FZJ-2026-02352
Abstract: This work provides a comprehensive analysis of the reciprocal system Mg2+, Ca2+ // Cl−, SO42−, which was experimentally investigated using thermal analysis, calorimetric techniques, and structural characterisation, and thermodynamically modelled using the FactSage software. The study aimed to deepen the understanding of phase equilibria and thermodynamic behaviour within this system, with a particular focus on exploring its potential as high-temperature phase change materials (PCMs). Within the framework of the reciprocal system, the phase equilibria of the four binary systems (MgCl2-CaCl2, MgSO4-CaSO4, MgCl2-MgSO4, CaCl2-CaSO4) are presented alongside sections representing the ionic exchange reaction (MgCl2-CaSO4 and CaCl2-MgSO4). The experimental results on phase equilibria and thermodynamics of MgCl2-CaCl2, MgCl2-CaSO4 and CaCl2-MgSO4 systems supported the modelling work. Given the presence of the intermediate sulphate-based compound CaMg2(SO4)3, the phase equilibria in the quasi-binary systems involving this phase and the chlorides (MgCl2-CaMg2(SO4)3 and CaCl2-CaMg2(SO4)3) were experimentally investigated. Based on all experimental findings, the Gibbs energy dataset in the reciprocal system Mg2+, Ca2+ // Cl−, SO42− was generated and presented in this study, contributing to the development and refinement of the thermodynamic database of inorganic salts, and providing valuable insights into the phase relationships and thermochemical behaviour of the reciprocal system.
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