Structure of Cu-Sn Melt at High Temperature

The temperature-dependent viscosity and X-ray diffraction (XRD) patterns of a Cu₆₅Sn₃₅ melt were investigated at high temperatures. The viscosity of the melt changed discontinuously at about 1283?K (1010?°C). An XRD analysis of the Cu₆₅Sn₃₅ melt revealed no obvious changes in the correlation radius, whereas the coordination number increased abruptly at a similar temperature with that mentioned previously, i.e., 1283?K (1010?°C) during the cooling process. The results indicate a redistribution of atoms in the nearest environment. The structural transition at the higher temperature was attributed to a change of combination mode of nearest atoms in the short-range order cluster of the Cu₆₅Sn₃₅ melt.