Enthalpies of mixing of liquid alloys in the In–Pd–Sn system and the limiting binary systems

The partial and integral enthalpies of mixing of molten binary In–Pd (up to about 29 at.% Pd), In–Sn (entire compositional range) and Pd–Sn (up to about 53 at.% Pd) alloys were determined at 900 °C. A Calvet-type microcalorimeter was used for the measurements employing a drop calorimetric technique. Additionally, five sections in the ternary In–Pd–Sn system (compositions up to about 40 at.% Pd) were investigated at 900 °C. The ternary interaction parameters were fitted using the Redlich–Kister–Muggiano model for substitutional solutions. The isoenthalpy curves for In–Pd–Sn at 900 °C were constructed for the integral molar enthalpy of mixing. Furthermore, the experimental results in the ternary system were compared with calculated values obtained by employing different binary extrapolation models.