Enthalpies of mixing of liquid systems for lead free soldering: Co—Sb—Sn

摘要

The partial and integral enthalpy of mixing of molten ternary Co—Sb-Sn alloys was determined performing high temperature drop calorimetry in a large compositional range at 1273 K. Measurements have been done along five sections, χ_(Sb)/χ_(Sn) ≈ 1:1,χ_(Sb)/χ__(Sn)≈ 1:3,χ__(Sb)/χ__(Sn) = 3:1,χ__(Co)/χ_(Sn) ≈ 1:4, and χ_(Co)/χ_(Sb) ≈ 1:5. Additionally, binary alloys of the constituent systems Co-Sb and Co-Sn were investigated at the same temperature. All the binary data were evaluated by means of a standard Redlich-Kister polynomial fit whereas ternary data were fitted on the basis of an extended Redlich—Kister—Muggianu model for substitutional solutions. An iso-enthalpy plot of the ternary system was constructed. In addition, the extrapolation Model of Toop was applied and compared to our data.