Enthalpy of mixing of liquid systems for lead free soldering: Ni–Sb–Sn system

AbstractThe partial and integral enthalpies of mixing of liquid ternary Ni–Sb–Sn alloys were determined along five sections xSb/xSn=3:1, xSb/xSn=1:1, xSb/xSn=1:3, xNi/xSn=1:4, and xNi/xSb=1:4 at 1000°C in a large compositional range using drop calorimetry techniques. The mixing enthalpy of Ni–Sb alloys was determined at the same temperature and described by a Redlich–Kister polynomial. The other binary data were carefully evaluated from literature values. Our measured ternary data were fitted on the basis of an extended Redlich–Kister–Muggianu model for substitutional solutions. Additionally, a comparison of these results to the extrapolation model of Toop is given. The entire ternary system shows exothermic values of ΔmixH ranging from approx. −1300J/mol, the minimum in the Sb–Sn binary system down to approx. −24,500J/mol towards Ni–Sb. No significant ternary interaction could be deduced from our data