Heiney P A, Bancel P A, Horn P M, Jordan J L, Laplaca S, Angilello J, Gayle F W
Science. 1987 Oct 30;238(4827):660-3. doi: 10.1126/science.238.4827.660.
Faceted dendrites of icosahedral AL(6)Li(3)Cu have been studied by high-resolution x-ray scattering. The samples display long-range icosahedral symmetry both in their diffraction patterns and in their macroscopic morphology. Despite the appearance of well-defined facets, the samples have a high degree of atomic disorder. The Bragg peaks have symmetry-dependent shapes and widths that scale linearly with G perpendicular (phason momentum). The peak widths are surprisingly similar to those found in icosahedral Al-Mn-Si alloys in both their absolute magnitude and their dependence on G perpendicular. The origin of these features in models for the icosahedral phase is discussed.
通过高分辨率X射线散射研究了二十面体AL(6)Li(3)Cu的多面树枝状晶体。这些样品在其衍射图案和宏观形态上均表现出长程二十面体对称性。尽管出现了清晰的晶面，但样品具有高度的原子无序性。布拉格峰具有与对称性相关的形状和宽度，它们与垂直于相位动量的G线性相关。在绝对大小及其对垂直于G的依赖性方面，这些峰宽与二十面体Al-Mn-Si合金中的峰宽惊人地相似。讨论了二十面体相中这些特征在模型中的起源。
