Abstract
The new Bi–Sn surface tension experimental data have been obtained by the pinned drop method for temperatures ranging from 623 to 1123 K and were subsequently compared with the model predicted values as well as with the literature data. Taking into account endothermic mixing in liquid Bi–Sn alloys, the surface properties (surface tension and surface segregation) were described by the Quasi-Chemical Approximation (QCA) for regular solution and the Self Association Model (SAM) aiming to estimate the effects of demixing on these properties. In addition, the transport and structural properties of Bi–Sn melts were analysed by theoretical models developed in the framework of statistical mechanics in conjunction with the Quasi-Lattice Theory (QLT) and Faber-Ziman Theory. The abovementioned properties are involved in the development of complex solder materials based on the Bi–Sn system.
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