Partial and integral enthalpies of mixing of Ag–Ga–Sn liquid alloys

A Calvet type calorimeter was used for measurement of partial and integral enthalpies of mixing of Ag–Ga–Sn alloys. The Ag–Ga binary alloys have been studied with 0 < xAg < 0.79 composition and in the 803–1073 K temperature range. The mixing enthalpies at 803 K of Ga–Sn binary alloys have been determined for xSn < 0.35. The Ag–Ga–Sn ternary liquid alloys have been investigated at 803 K along the following sections: xAg/xGa = 1/3, xAg/xGa = 0.36/0.64, xAg/xGa = 1/1, xGa/xSn = 1/3, xGa/xSn = 1/1, xGa/xSn = 0.65/0.35 and xGa/xSn = 3/1.Experimental data were used to obtain the binary interaction parameters by using the Redlich–Kister polynomial for the Ag–Ga binary system, while the Redlich–Kister–Muggianu method was used to determine the ternary interaction parameters for the Ag–Ga–Sn system. The experimental values and the fitted curves were compared with those predicted from the Muggianu and Toop methods.

► Due to environmental concerns the search for lead-free solders has started in Europe several years ago.
► Among the potential new materials there are also systems based on Ag–Sn alloys, one of them being the ternary Ag–Ga–Sn system.
► The present work refers to high temperature calorimetric measurements on Ag–Ga–Sn liquid alloys performed along different cross-sections.