State Key Laboratory for Advanced Metals and Materials, University of Science &Technology Beijing, Beijing 100083, China.
Crystal Structure Laboratory and National Laboratory of Mineral Materials, China University of Geosciences (Beijing), Beijing 100083, China.
Sci Rep. 2017 Jan 13;7:40510. doi: 10.1038/srep40510.
By means of atomic-resolution high-angle annular dark-field scanning transmission electron microscopy, we found three types of giant approximants of decagonal quasicrystal in Al-Cr-Fe-Si alloys, where each type contains several structural variants possessing the same lattice parameters but different crystal structures. The projected structures of these approximants along the pseudo-tenfold direction were described using substructural blocks. Furthermore, the structural relationship and the plane crystallographic groups in the (a, c) plan of these structural variants was also discussed. The diversity of quasicrystal approximants with the same lattice parameters was shown to be closely related to the variety of shield-like tiles and their tiling patterns.
通过原子分辨率高角度环形暗场扫描透射电子显微镜，我们在 Al-Cr-Fe-Si 合金中发现了三种十次准晶的巨型近晶，其中每种类型包含几种具有相同晶格参数但不同晶体结构的结构变体。这些近晶的沿拟十重方向的投影结构使用亚结构块来描述。此外，还讨论了这些结构变体在（a，c）平面中的结构关系和平面晶体群。具有相同晶格参数的准晶近晶的多样性与屏蔽状瓦片及其平铺模式的多样性密切相关。
