The temperature-induced anomalous liquid-structure change in melt In 20 Sn 80 observed by Zu et al. ͓Phys. Rev. Lett. 89, 125505 ͑2002͔͒ has been studied. The structure transition in In 20 Sn 80 is further confirmed by the presence of an exothermic peak in the differential-scanning-calorimetry ͑DSC͒ curve. From experimental data of pair distribution functions, we calculated the viscosity ͑͒ and the excess entropy ͑S͒ and found that there is a valley of viscosity in the -T curve and a valley of excess entropy in the S-T curve, which are consistent with the internal-friction ͑Q −1 ͒ peak in the Q −1 -T curve and the exothermic peak in the DSC curve, respectively. We decomposed S into two parts, S͑1͒ and S͑2͒, which are related to the total potential and the isothermal compressibility, respectively. The behaviors of S͑1͒ and S͑2͒ tell us that the atomic bonds vary twice and the microstructures transform twice in the temperature range from 300 to 900°C for liquid In 20 Sn 80 . The similar analysises of liquid In 80 Sn 20 and liquid Sn reveal that Sn plays a crucial role in the discontinuous structure change in liquid In 20 Sn 80 .
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