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The enthalpies of mixing of Ge-Mn melts are determined in the range 1550-1840 by isoperibol calorimetry. The formation of these melts is shown to be accompanied by significant heat release: ∆ mix H max = − 25.12 ± 1.4 kJ/mol at x Mn = 0.7. Ge activity is evaluated from the position of the liquidus line. The Mn and Ge activities in this system exhibit negative deviations from Raoult's law. The new and earlier data on the thermodynamic properties of Ge-Mn melts are analyzed.

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