001047173 001__ 1047173 001047173 005__ 20260106202634.0 001047173 0247_ $$2doi$$a10.1016/j.calphad.2025.102888 001047173 0247_ $$2ISSN$$a0364-5916 001047173 0247_ $$2ISSN$$a1873-2984 001047173 0247_ $$2datacite_doi$$a10.34734/FZJ-2025-04130 001047173 037__ $$aFZJ-2025-04130 001047173 082__ $$a540 001047173 1001_ $$0P:(DE-Juel1)190252$$aMorsa, Amedeo$$b0$$eCorresponding author 001047173 245__ $$aThermodynamics of the MgCl2-MgSO4 and CaCl2-CaSO4 systems 001047173 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2025 001047173 3367_ $$2DRIVER$$aarticle 001047173 3367_ $$2DataCite$$aOutput Types/Journal article 001047173 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1767697770_17995 001047173 3367_ $$2BibTeX$$aARTICLE 001047173 3367_ $$2ORCID$$aJOURNAL_ARTICLE 001047173 3367_ $$00$$2EndNote$$aJournal Article 001047173 520__ $$aThermodynamic properties of MgCl2-MgSO4 and CaCl2-CaSO4 binary systems hold significant importance in the exploration of potential phase change materials for thermal energy storage applications. This study aims to elucidate the phase diagrams and thermodynamic properties of the eutectic mixtures within these systems, employing experimental techniques such as Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC). Through comprehensive experimental investigations, the phase diagrams of the MgCl2-MgSO4 and CaCl2-CaSO4 systems were meticulously delineated, revealing the eutectic compositions and transition temperatures. Specifically, the eutectic composition for MgCl2-MgSO4 was proposed to be 28.0 mol% MgSO4 with a melting temperature of 663 ± 5 °C, while for the CaCl2-CaSO4 system it was found to be at 14.0 mol% CaSO4 and 722 ± 5 °C. Additionally, the enthalpy of fusion of these eutectic mixtures was for the first time determined, providing crucial insights into their thermal behaviour. They are 38.2 ± 1.0 kJ/mol for the Mg-containing system and 30.2 ± 0.4 kJ/mol for the Ca-containing system, respectively. The experimental data obtained in this study served as the foundation for the development of a new Gibbs energy dataset, which is essential for conducting thermodynamic calculations. 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