Structural disordering in Sn-Pb(Bi) eutectic melts induced by heating

The structure of liquid Sn_0.739Pb_0.261 and Sn_0.57Bi_0.43 eutectic alloys was studied by means of X-ray diffraction at several temperatures. Structure factors, pair correlation functions and the main structural parameters obtained on their basis were analyzed. We show that the structure of the Sn_0.739Pb_0.261 and Sn_0.57Bi_0.43 eutectic alloys is inhomogeneous and consists of different types of clusters. Upon heating the cluster structure undergoes topological and chemical disordering showing a significant dependence of structural parameters on temperature near the melting point