Abstract
The partial mixing enthalpies of the components (Δm\( \bar H \)i) of the Ni-Ga melts were measured using the high-temperature isoperibolic calorimetry at 1770 ± 5 K in wide concentration interval. The limiting partial mixing enthalpy of gallium in a liquid nickel (Δm\( \bar H \)Ga∞) is −95.5 ± 19.8 kJ mol−1, and similar function of nickel in liquid gallium (Δm\( \bar H \)Ni∞) is −74.5 ± 16.4 kJ mol−1. The integral mixing enthalpy of liquid alloys of this system was calculated from partial enthalpies for the whole concentration area (ΔmHmin = −32.1 ± 2.7 kJ mol−1 at xNi = 0.5). The ΔmH value of liquid nickel-gallium alloys independence of the temperature is confirmed. Enthalpies of formation of liquid (ΔmH) phases of Ni-Ga system were compared with ones for solid (ΔfH) phases of this system. An analysis of d-metals influence on formation energy of Ga-d-Me melts was made using the values of ΔfH for intermediate phases of these systems. The article was translated by the authors.
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