The structural change of Cu-Sn melt

With the high-temperature viscometer and magnetic susceptibility measurement device designed by our group, the viscosity and the magnetic susceptibility of the Cu₆₅Sn₃₅ melt were measured during the cooling process. An anomalous change can be found in the curves of viscosity and magnetic susceptibility at a certain temperature. The structure of the melt was studied by the high-temperature X-ray diffractometer. The anomalous change also can be found in the pair distribution function, correlation radius, and coordination number at the approximate temperature, which shows the microstructural change of the Cu₆₅Sn₃₅ melt. From the results, it was confirmed that the Cu₆Sn₅ compound occurs in the melt, which leads to the structural change of the melt. Supported by the National Natural Science Foundation of China (Grant Nos. 50395101 and 50571052)