| The temperature dependence of viscosity of liquid Bi60Ga40 alloy has been measured using torsional oscillation viscosity measurement. The results show that the change of viscosity with temperature is distinctly discontinuous, which can be divided into three parts: the changes in high temperature region, mid-temperature region, as well as low temperature region. In these different regions, the structures of melt are distinct. The viscous flow activation energy E and group size vm in low-temperature zone, namely, the liquid-liquid phase separation zone are larger than those in the medium-temperature and high-temperature zone zone, and E and vm in the medium-temperature zone is the smallest. There is only low temperature anomalous point on the resistivity-temperature curve in liquid-liquid phase separation zone. The appearance of exothermic peaks on DSC curve during cooling process further proved the structure changes of melt in 893-923K. The liquid-liquid phase separation is naturally accompanied with structure change of melt in 535-563K, which is also reflected by the discontinuous change of viscosity and DSC analysis. |
full paper (pdf, 256 Kb)