Proposal for universality in the viscosity of metallic liquids.
Proposal for universality in the viscosity of metallic liquids.
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DOI：
10.1038/srep13837
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发表时间：
2015-09-09
影响因子：
4.6
通讯作者：
Kelton KF
中科院分区：
文献类型：
--
作者：
Blodgett ME;Egami T;Nussinov Z;Kelton KF
作为温度函数的液体粘度η的大小范围是任何物理性质中最令人印象深刻的一个，从其在无限温度下的外推值（η 0）到玻璃化转变温度Tg下的外推值变化约17个数量级。我们提出了无容器处理金属液体的实验测量，表明log（η/ηo）作为TA/T的函数是一个潜在的通用标度曲线。与以前的方法形成鲜明对比的是，缩放只需要两个拟合参数，这是平均可预测的。温度TA对应于协同运动的开始，并与Tg强烈相关，表明玻璃化转变的过程首先出现在高温液体中。
The range of magnitude of the liquid viscosity, η, as a function of temperature is one of the most impressive of any physical property, changing by approximately 17 orders of magnitude from its extrapolated value at infinite temperature (ηo) to that at the glass transition temperature, Tg. We present experimental measurements of containerlessly processed metallic liquids that suggest that log(η/ηo) as a function of TA/T is a potentially universal scaled curve. In stark contrast to previous approaches, the scaling requires only two fitting parameters, which are on average predictable. The temperature TA corresponds to the onset of cooperative motion and is strongly correlated with Tg, suggesting that the processes underlying the glass transition first appear in the high temperature liquid.