The mixing enthalpies of Sr–Sb melts were measured by isoperibolic calorimetry at 1230 K over the entire composition range referred to the liquid components. Large exothermic mixing effects were found (∆Hmin = –70.1 ± 4.8 kJ/mole). They were indicative of very strong interaction between the components and agreed with the Sr–Sb phase diagram. A series of intermetallic compounds, SrSb, SrSb3, Sr3Sb2, and Sr2Sb, was found in the system. Minimum ∆H for the liquid alloys corresponds to the composition range where SrSb and Sr3Sb2 phases exist. The mixing enthalpies were found to be less exothermic than those for the intermetallic phases. This finding agrees with data for the alloys in systems with strong interaction between the components and is indicative of short-range ordering in liquid state. The mixing enthalpies for Mg (Ca, Sr)–Sb melts decrease in the Mg–Sb → Ca–Sb → Sr–Sb series, which agrees with increasing differences in the electronegativity of the components.
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Translated from Poroshkova Metallurgiya, Vol. 58, Nos. 11–12 (530), pp. 132–137, 2019.
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Ivanov, M., Romanova, L., Shevchenko, M. et al. Mixing Enthalpies of Sr–Sb Melts. Powder Metall Met Ceram 58, 725–729 (2020). https://doi.org/10.1007/s11106-020-00129-6
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DOI: https://doi.org/10.1007/s11106-020-00129-6