Structural features of liquid metallic glass former

The structural parameters of Au75Si25 alloy, pure Au, Al88Si12, Cu87Sn13, In98Al2 and Al93Ni7 alloys have been measured by X-ray diffractometer. It is found that there are subpeaks in the pair correlation functions in liquid Au75Si25 alloy. The addition of Si in liquid Au results in a decrease in both the correlation radius and the coordination number of the nearest atomic neighbors. The Au75Si25 alloy nearest atomic distance has a more stable dependence on temperature compared to In98Al2, Al93Ni7 and Cu87Sn13 alloys. The atomic density change of liquid Au75Si25 alloy is less dependent on temperature than the liquid Au and Al88Si12 alloy. The liquid metallic good glass former Au75Si25 alloy possesses a more stable liquid structure than that of poor glass formers, indicating the essential of the fragility of the superheated melts.