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Group Theoretical Analysis of Quasicrystallography from Projections of Higher Dimensional Lattices Bn

机译:从投影的预测看准晶组的理论分析   高维格子Bn

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摘要

A group theoretical discussion on the hypercubic lattice described by theaffine Coxeter-Weyl group Wa(Bn) has been presented. When the lattice isprojected onto the Coxeter plane it is noted that the maximal dihedral subgroupDh of W(Bn) with h = 2n representing the Coxeter number describes the h-foldsymmetric quasicrystallography. Higher dimensional cubic lattices areexplicitly constructed for n = 4, 5, 6. Their rank 3 Coxeter subgroups andmaximal dihedral subgroups are identified. It has been explicitly shown thatwhen their Voronoi cells are decomposed under the respective rank 3 subgroupsW(A3),W(H2) x W(A1) and W(H3) one obtains the rhombic dodecahedron, rhombicicosahedron and rhombic triacontahedron respectively. Projection of the latticeB4 onto the Coxeter plane represents quasicrystal structures with 8-foldsymmetry. The B5 lattice is used to describe the quasicrystals with both 5-foldand 10-fold symmetries. The lattice B6 can describe a 12-fold symmetricquasicrystal as well as a 3D icosahedral quasicrystal depending on the choiceof subspace of projections. The novel structures from the projected sets oflattice points are compatible with the available experimental data.
机译:提出了关于仿射科克塞特-魏尔基Wa(Bn)描述的超三次晶格的小组理论讨论。当将晶格投影到Coxeter平面上时,应注意W(Bn)的最大二面子群Dh(其中h = 2n代表Coxeter数)描述了h折叠对称准晶体学。明确构造了n = 4、5、6的高维立方晶格。确定了它们的3级Coxeter子组和最大二面体子组。已经明确表明,当它们的Voronoi细胞在相应的第3级亚组W(A3),W(H2)×W(A1)和W(H3)下分解时,分别获得菱形十二面体,菱形二十面体和菱形三正二十面体。晶格B4在Coxeter平面上的投影表示具有8倍对称性的准晶体结构。 B5晶格用于描述具有5倍和10倍对称性的准晶体。取决于投影子空间的选择,晶格B6可以描述12倍对称准晶体以及3D二十面体准晶体。投影点阵的新颖结构与可用的实验数据兼容。

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