Lee G W, Gangopadhyay A K, Kelton K F, Hyers R W, Rathz T J, Rogers J R, Robinson D S
Department of Physics, Washington University, St. Louis, Missouri 63130, USA.
Phys Rev Lett. 2004 Jul 16;93(3):037802. doi: 10.1103/PhysRevLett.93.037802.
New short-range order data are presented for equilibrium and undercooled liquids of Ti and Ni. These were obtained from in situ synchrotron x-ray diffraction measurements of electrostatically levitated droplets. While the short-range order of liquid Ni is icosahedral, consistent with Frank's hypothesis, significantly distorted icosahedral order is observed in liquid Ti. This is the first experimental observation of distorted icosahedral short-range order in any liquid, although this has been predicted by theoretical studies on atomic clusters.
本文给出了Ti和Ni的平衡态及过冷液体的新的短程有序数据。这些数据是通过对静电悬浮液滴进行原位同步辐射X射线衍射测量得到的。虽然液态Ni的短程有序是二十面体的，这与弗兰克假说一致，但在液态Ti中观察到了明显扭曲的二十面体有序。这是在任何液体中首次对扭曲的二十面体短程有序进行实验观测，尽管这已被原子团簇的理论研究所预测。
