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Yang Y, Chen Y, Dong C, Wang Y, Wang X, Liu H, Yang Q. Structure of an Al 64Cu 22Co 14 decagonal quasicrystal studied by Cs-corrected STEM. Micron 2021; 153:103194. [PMID: 34896684 DOI: 10.1016/j.micron.2021.103194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 11/24/2021] [Accepted: 11/30/2021] [Indexed: 10/19/2022]
Abstract
During the last several decades, since the discovery of a decagonal quasicrystal, a 2 nm cluster model has been widely accepted as its basic quasi-unit-cell (QUC). Instead of the traditional 2 nm QUC, a 3.2 nm QUC is proposed in this paper. The 3.2 nm QUC can fill all the blank areas. The 3.2 nm QUC consists of 251 atoms. The element type and position of each atom are determined using high-angle annular detector dark-field (HAADF) images taken along three projection directions, i.e., one along the ten-fold symmetry and the other two along the two-fold symmetry with an intersection angle of 18 degrees. The proposed model opens an avenue for further investigation of the aperiodic atomic structure of other quasicrystals.
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Affiliation(s)
- Yi Yang
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China
| | - Yongjun Chen
- School of Mechanical Engineering & Automation, University of Science and Technology Liaoning, Anshan, Liaoning, 114051, China
| | - Chuang Dong
- School of Materials Science and Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, China
| | - Yanguo Wang
- Beijing Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Xurong Wang
- College of Physics and Information Science, Hunan Normal University, 36 Lushan Road, Changsha, Hunan, 410081, China
| | - Hongrong Liu
- College of Physics and Information Science, Hunan Normal University, 36 Lushan Road, Changsha, Hunan, 410081, China
| | - Qibin Yang
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan, 411105, China.
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Ma H, He Z, Li H, Zhang T, Zhang S, Dong C, Steurer W. Novel kind of decagonal ordering in Al 74Cr 15Fe 11. Nat Commun 2020; 11:6209. [PMID: 33277472 PMCID: PMC7718917 DOI: 10.1038/s41467-020-20077-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 11/11/2020] [Indexed: 11/17/2022] Open
Abstract
A high-angle annular dark field scanning transmission electron microscopy study of the intermetallic compound Al74Cr15Fe11 reveals a quasiperiodic structure significantly differing from the ones known so far. In contrast to the common quasi-unit-cells based on Gummelt decagons, the present structure is related to a covering formed by Lück decagons, which can also be described by a Hexagon-Bow-Tie tiling. The description of quasicrystal structures by only one repeating unit is desirable. Here the authors experimentally identify a quasi-unit-cell corresponding to a Lück decagon to describe the randomly ordered structure of a decagonal quasicrystalline phase.
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Affiliation(s)
- Haikun Ma
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
| | - Zhanbing He
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China.
| | - Hua Li
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
| | - Tiantian Zhang
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
| | - Shuang Zhang
- School of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, China
| | - Chuang Dong
- School of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, China.,Key Laboratory for Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian, 116024, China
| | - Walter Steurer
- Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
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Wang WZ, Zhou XZ, Yang ZQ, Qi Y, Ye HQ. A decagonal quasicrystal with rhombic and hexagonal tiles decorated with icosahedral structural units. IUCRJ 2020; 7:535-541. [PMID: 32431836 PMCID: PMC7201276 DOI: 10.1107/s2052252520004297] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 03/30/2020] [Indexed: 06/11/2023]
Abstract
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).
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Affiliation(s)
- W. Z. Wang
- School of Materials Science and Engineering, Northeastern University, Shenyang 110819, People’s Republic of China
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, People’s Republic of China
| | - X. Z. Zhou
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, People’s Republic of China
| | - Z. Q. Yang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, People’s Republic of China
| | - Y. Qi
- School of Materials Science and Engineering, Northeastern University, Shenyang 110819, People’s Republic of China
| | - H. Q. Ye
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, People’s Republic of China
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He Z, Shen Y, Ma H, Sun J, Ma X, Li H, Steurer W. Quasicrystal-related mosaics with periodic lattices interlaid with aperiodic tiles. ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES 2020; 76:137-144. [PMID: 32124852 DOI: 10.1107/s2053273320000066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 01/06/2020] [Indexed: 11/10/2022]
Abstract
Quasicrystals, which have long-range orientational order without translational symmetry, are incompatible with the theory of conventional crystals, which are characterized by periodic lattices and uniformly repeated unit cells. Reported here is a novel quasicrystal-related solid state observed in two Al-Cr-Fe-Si alloys, which can be described as a mosaic of aperiodically distributed unit tiles in translationally periodic structural blocks. This new type of material possesses the opposing features of both conventional crystals and quasicrystals, which might trigger wide interest in theory, experiments and the potential applications of this type of material.
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Affiliation(s)
- Zhanbing He
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
| | - Yihan Shen
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Haikun Ma
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
| | - Junliang Sun
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Xiuliang Ma
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People's Republic of China
| | - Hua Li
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
| | - Walter Steurer
- Department of Materials, ETH Zurich, Zurich 8093, Switzerland
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He Z, Li H, Ma H, Li G. Multiple quasicrystal approximants with the same lattice parameters in Al-Cr-Fe-Si alloys. Sci Rep 2017; 7:40510. [PMID: 28084405 PMCID: PMC5233979 DOI: 10.1038/srep40510] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 12/06/2016] [Indexed: 11/17/2022] Open
Abstract
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.
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Affiliation(s)
- Zhanbing He
- State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China
| | - Hua Li
- State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China
| | - Haikun Ma
- State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China
| | - Guowu Li
- Crystal Structure Laboratory and National Laboratory of Mineral Materials, China University of Geosciences (Beijing), Beijing 100083, China
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