Structure of icosahedral clusters in cubic Al5.6Li
Structure of icosahedral clusters in cubic Al5.6Li
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立方Al5.6Li中二十面体团簇的结构
DOI：
10.1103/physrevb.37.8495
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Gayle
中科院分区：
文献类型：
--
作者：
Guryan;Stephens;Goldman;Gayle
我们提出了一个晶体Al/sub 5.6/Li/sub 2.9/Cu的结构细化的基础上的X射线和中子衍射数据。我们发现原子团簇在体心立方晶格中形成接近理想的二十面体，其位置和占位性与以前的工作中提出的不同。由于中子和X射线对Al、Li和Cu具有非常不同的散射振幅，并且由于它们各自的衍射轮廓因此由不同的峰强度组成，因此来自两个拟合的结构参数的紧密一致性是我们结果正确性的有力论据。这些应该是有用的包装模型描述相关的二十面体相。
We present a structure refinement of crystalline Al/sub 5.6/Li/sub 2.9/Cu based on x-ray and neutron diffraction data. We find that clusters of atoms form nearly ideal icosahedra in a bcc lattice, with different positions and occupancies than those proposed in previous work. Since neutrons and x rays have very different scattering amplitudes for Al, Li, and Cu, and since their respective diffraction profiles therefore consist of different peak intensities, the close agreement of the structural parameters from the two fits is a strong argument for the correctness of our results. These should be useful in packing-model descriptions of the related icosahedral phase.