A case for local icosahedral order in undercooled metallic liquids and the influence on the nucleation barrier
A case for local icosahedral order in undercooled metallic liquids and the influence on the nucleation barrier
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DOI：
10.1016/j.jnoncrysol.2006.08.009
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发表时间：
2006-12
影响因子：
3.5
通讯作者：
K. Kelton;A. Gangopadhyay;T. H. Kim;G. Lee
中科院分区：
文献类型：
--
作者：
K. Kelton;A. Gangopadhyay;T. H. Kim;G. Lee
综述了近年来关于过冷液体的实验和理论研究，指出了过冷液体发展的短程规律。我们的原位同步x射线衍射研究的静电悬浮液滴元素Ti， Zr和Ni液体和协调过冷和结构研究的Ti - Zr - Ni液体形成一个二十面体准晶体讨论这些研究的背景下。二十面体序被证明是所有研究过冷液体结构的主要组成部分，尽管随着d波段键特性的重要性增加，二十面体序变得明显扭曲。正如弗兰克在半个多世纪前预测的那样，液态的短程序与成核势垒相互作用。
An overview of recent experimental and theoretical investigations on undercooled liquids is given, indicating developing short-range order with undercooling. Our in situ synchrotron X-ray diffraction studies of electrostatically levitated droplets of elemental Ti, Zr, and Ni liquids and coordinated undercooling and structural studies of a Ti–Zr–Ni liquid that forms an icosahedral quasicrystal are discussed in the context of these investigations. Icosahedral order is demonstrated to be a dominant component to the structures of all undercooled liquids studied, although it becomes significantly distorted with an increasing importance of the d-band bonding character. The liquid short-range order couples with the nucleation barrier, as predicted by Frank over a half-century ago.