The evolution of coordination structure in liquid GaSn alloy

The dynamic viscosity and the liquid structure of Ga98Sn2 alloy melt at different temperatures were measured by a torsional oscillation viscometer and an x-ray diffraction. The viscosity of the liquid Ga98Sn2 alloy increases with decreasing temperature and an obvious turning point is observed on the Arrhenius curve. The breakpoint in Arrhenius plot emerges when the structure of Ga98Sn2 alloy melt is transformed from the high coordinated polyhedron clusters to the low coordinated polyhedron clusters. It is found that the change of the viscosity is a characteristic of microstructure transformation in the alloy melt.