Quantitative analysis based on the pair distribution function for understanding the anomalous liquid-structure change in In20Sn80 -: art. no. 064204
Quantitative analysis based on the pair distribution function for understanding the anomalous liquid-structure change in In20Sn80 -: art. no. 064204
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基于对分布函数的定量分析理解In20Sn80中的异常液体结构变化
DOI：
10.1103/physrevb.71.064204
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发表时间：
2005-02-01
影响因子：
3.7
通讯作者：
Wu, AQ
中科院分区：
文献类型：
--
作者：
Liu, CS;Li, GX;Wu, AQ
The temperature-induced anomalous liquid-structure change in melt ${\mathrm{In}}_{20}{\mathrm{Sn}}_{80}$ observed by Zu et al. [Phys. Rev. Lett. 89, 125505 (2002)] has been studied. The structure transition in ${\mathrm{In}}_{20}{\mathrm{Sn}}_{80}$ is further confirmed by the presence of an exothermic peak in the differential-scanning-calorimetry (DSC) curve. From experimental data of pair distribution functions, we calculated the viscosity $(\ensuremath{\eta})$ and the excess entropy $(S)$ and found that there is a valley of viscosity in the $\ensuremath{\eta}\text{\ensuremath{-}}T$ curve and a valley of excess entropy in the $S\text{\ensuremath{-}}T$ curve, which are consistent with the internal-friction $({Q}^{\ensuremath{-}1})$ peak in the ${Q}^{\ensuremath{-}1}\text{\ensuremath{-}}T$ curve and the exothermic peak in the DSC curve, respectively. We decomposed $S$ into two parts, $S(1)$ and $S(2)$, which are related to the total potential and the isothermal compressibility, respectively. The behaviors of $S(1)$ and $S(2)$ tell us that the atomic bonds vary twice and the microstructures transform twice in the temperature range from 300 to 900 \ifmmode^\circ\else\textdegree\fi{}C for liquid ${\mathrm{In}}_{20}{\mathrm{Sn}}_{80}$. The similar analysises of liquid ${\mathrm{In}}_{80}{\mathrm{Sn}}_{20}$ and liquid Sn reveal that Sn plays a crucial role in the discontinuous structure change in liquid ${\mathrm{In}}_{20}{\mathrm{Sn}}_{80}$.
The temperature-induced anomalous liquid-structure change in melt ${\mathrm{In}}_{20}{\mathrm{Sn}}_{80}$ observed by Zu et al. [Phys. Rev. Lett. 89, 125505 (2002)] has been studied. The structure transition in ${\mathrm{In}}_{20}{\mathrm{Sn}}_{80}$ is further confirmed by the presence of an exothermic peak in the differential-scanning-calorimetry (DSC) curve. From experimental data of pair distribution functions, we calculated the viscosity $(\ensuremath{\eta})$ and the excess entropy $(S)$ and found that there is a valley of viscosity in the $\ensuremath{\eta}\text{\ensuremath{-}}T$ curve and a valley of excess entropy in the $S\text{\ensuremath{-}}T$ curve, which are consistent with the internal-friction $({Q}^{\ensuremath{-}1})$ peak in the ${Q}^{\ensuremath{-}1}\text{\ensuremath{-}}T$ curve and the exothermic peak in the DSC curve, respectively. We decomposed $S$ into two parts, $S(1)$ and $S(2)$, which are related to the total potential and the isothermal compressibility, respectively. The behaviors of $S(1)$ and $S(2)$ tell us that the atomic bonds vary twice and the microstructures transform twice in the temperature range from 300 to 900 \ifmmode^\circ\else\textdegree\fi{}C for liquid ${\mathrm{In}}_{20}{\mathrm{Sn}}_{80}$. The similar analysises of liquid ${\mathrm{In}}_{80}{\mathrm{Sn}}_{20}$ and liquid Sn reveal that Sn plays a crucial role in the discontinuous structure change in liquid ${\mathrm{In}}_{20}{\mathrm{Sn}}_{80}$.