A decagonal quasicrystal with rhombic and hexagonal tiles decorated with icosahedral structural units

被引：4

作者：

Wang, W. Z. ^{[1
,2
]}

Zhou, X. Z. ^{[2
]}

Yang, Z. Q. ^{[2
]}

Qi, Y. ^{[1
]}

Ye, H. Q. ^{[2
]}

机构：

[1] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

来源：

IUCRJ | 2020年 / 7卷

关键词：

decagonal quasicrystals; icosahedrons; Penrose tiling; electron diffraction; scanning-transmission electron microscopy; ZN-MG-DY; ATOMIC-STRUCTURE; PENROSE PATTERNS; SYMMETRY; PHASE; MICROSCOPY; MODEL;

D O I：

10.1107/S2052252520004297

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The structure of a decagonal quasicrystal in the Zn58Mg40Y2 (at. %) alloy was studied using electron diffraction and atomic resolution Z-contrast imaging techniques. This stable Frank-Kasper Zn-Mg-Y decagonal quasicrystal has an atomic structure which can be modeled with a rhombic/hexagonal tiling decorated with icosahedral units at each vertex. No perfect decagonal clusters were observed in the Zn-Mg-Y decagonal quasicrystal, which differs from the Zn-Mg-Dy decagonal crystal with the same space group P10/mmm. Y atoms occupy the center of 'dented decagon' motifs consisting of three fat rhombic and two flattened hexagonal tiles. About 75% of fat rhombic tiles are arranged in groups of five forming star motifs, while the others connect with each other in a 'zigzag' configuration. This decagonal quasicrystal has a composition of Zn68.3Mg29.1Y2.6 (at. %) with a valence electron concentration (e/a) of about 2.03, which is in accord with the Hume-Rothery criterion for the formation of the Zn-based quasicrystal phase (e/a = 2.0-2.15).

引用

页码：535 / 541

页数：7

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