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Buganski I, Wolny J, Takakura H. The atomic structure of the Bergman-type icosahedral quasicrystal based on the Ammann-Kramer-Neri tiling. Acta Crystallogr A Found Adv 2020; 76:180-196. [PMID: 32124856 PMCID: PMC7053224 DOI: 10.1107/s2053273319017339] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 12/30/2019] [Indexed: 11/16/2022] Open
Abstract
In this study, the atomic structure of the ternary icosahedral ZnMgTm quasicrystal (QC) is investigated by means of single-crystal X-ray diffraction. The structure is found to be a member of the Bergman QC family, frequently found in Zn-Mg-rare-earth systems. The ab initio structure solution was obtained by the use of the Superflip software. The infinite structure model was founded on the atomic decoration of two golden rhombohedra, with an edge length of 21.7 Å, constituting the Ammann-Kramer-Neri tiling. The refined structure converged well with the experimental diffraction diagram, with the crystallographic R factor equal to 9.8%. The Bergman clusters were found to be bonded by four possible linkages. Only two linkages, b and c, are detected in approximant crystals and are employed to model the icosahedral QCs in the cluster approach known for the CdYb Tsai-type QC. Additional short b and a linkages are found in this study. Short interatomic distances are not generated by those linkages due to the systematic absence of atoms and the formation of split atomic positions. The presence of four linkages allows the structure to be pictured as a complete covering by rhombic triacontahedral clusters and consequently there is no need to define the interstitial part of the structure (i.e. that outside the cluster). The 6D embedding of the solved structure is discussed for the final verification of the model.
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Affiliation(s)
- Ireneusz Buganski
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, Krakow, 30-059, Poland
- Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Janusz Wolny
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, Krakow, 30-059, Poland
| | - Hiroyuki Takakura
- Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
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Yamada T, Nakamura Y, Watanuki T, Machida A, Mizumaki M, Nitta K, Sato A, Matsushita Y, Tsai AP. Formation of an Intermediate Valence Icosahedral Quasicrystal in the Au-Sn-Yb System. Inorg Chem 2019; 58:9181-9186. [PMID: 31247815 DOI: 10.1021/acs.inorgchem.9b00801] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report on the formation of a new icosahedral quasicrystal (iQC) in the Au-Sn-Yb alloy system. This iQC has a primitive icosahedral lattice with a lattice constant aico of 0.5447(7) nm and a composition that was determined to be Au60.0Sn26.7Yb13.3. X-ray absorption spectroscopy measurement of the near Yb L3 edge demonstrates that the Yb valence in the iQC is an intermediate valence between divalent (4f14) and trivalent (4f13) at ambient pressure and was determined to be 2.18+. The results are compared to those for a corresponding 2/1 cubic approximant crystal. The formation of this new iQC is discussed in terms of the atomic size factor (δ) and the valence electron-to-atom ratio (e/a).
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Affiliation(s)
- Tsunetomo Yamada
- Department of Applied Physics, Faculty of Science , Tokyo University of Science , 6-3-1, Niijuku , Katsushika-ku, Tokyo 125-8585 , Japan
| | - Yoko Nakamura
- Institute of Multidisciplinary Research for Advanced Materials , Tohoku University , 2-1-1 Katahira, Aoba-ku , Sendai , Miyagi 980-8577 , Japan
| | - Tetsu Watanuki
- Synchrotron Radiation Research Center , National Institutes for Quantum and Radiological Science and Technology , 1-1-1 Kouto , Sayo , Hyogo 679-5148 , Japan
| | - Akihiko Machida
- Synchrotron Radiation Research Center , National Institutes for Quantum and Radiological Science and Technology , 1-1-1 Kouto , Sayo , Hyogo 679-5148 , Japan
| | - Masaichiro Mizumaki
- Japan Synchrotron Radiation Research Institute (JASRI) , 1-1-1 Kouto , Sayo , Hyogo 679-5198 , Japan
| | - Kiyofumi Nitta
- Japan Synchrotron Radiation Research Institute (JASRI) , 1-1-1 Kouto , Sayo , Hyogo 679-5198 , Japan
| | - Akira Sato
- Research Network and Facility Services Division , National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - Yoshitaka Matsushita
- Research Network and Facility Services Division , National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
| | - An-Pang Tsai
- Institute of Multidisciplinary Research for Advanced Materials , Tohoku University , 2-1-1 Katahira, Aoba-ku , Sendai , Miyagi 980-8577 , Japan
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de Boissieu M. Ted Janssen and aperiodic crystals. ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES 2019; 75:273-280. [PMID: 30821260 PMCID: PMC6396404 DOI: 10.1107/s2053273318016765] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 11/25/2018] [Indexed: 11/24/2022]
Abstract
Ted Janssen’s contributions to the field of aperiodic crystals are reviewed. This article reviews some of Ted Janssen’s (1936–2017) major contributions to the field of aperiodic crystals. Aperiodic crystals are long-range ordered structures without 3D lattice translations and encompass incommensurately modulated phases, incommensurate composites and quasicrystals. Together with Pim de Wolff and Aloysio Janner, Ted Janssen invented the very elegant theory of superspace crystallography that, by adding a supplementary dimension to the usual 3D space, allows for a deeper understanding of the atomic structure of aperiodic crystals. He also made important contributions to the understanding of the stability and dynamics of aperiodic crystals, exploring their fascinating physical properties. He constantly interacted and collaborated with experimentalists, always ready to share and explain his detailed understanding of aperiodic crystals.
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Affiliation(s)
- Marc de Boissieu
- Université Grenoble Alpes, CNRS, SIMaP, 1130 Rue de la Piscine, BP 75, 38402 St Martin d Heres, France
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Affiliation(s)
- Janusz Wolny
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakow, Poland
| | - Ireneusz Bugański
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakow, Poland
| | - Radosław Strzałka
- Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakow, Poland
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Catlow CRA. Developments in the structural science of materials. IUCRJ 2017; 4:199-201. [PMID: 28512565 PMCID: PMC5414392 DOI: 10.1107/s2052252517006145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Recent developments in the structural science of materials and the growing power of computational methods in this field are discussed.
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Affiliation(s)
- C. Richard A. Catlow
- Department of Chemistry, University College London, 20 Gordon St., London WC1H OAJ, UK
- School of Chemistry, Cardiff University, Cardiff CF10 3AT, UK
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Statistical Approach to Diffraction of Periodic and Non-Periodic Crystals—Review. CRYSTALS 2016. [DOI: 10.3390/cryst6090104] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
Higher-dimensional structure analysis of quasicrystals is now possible. Yamada et al. [IUCrJ (2016), 3, 247-258] have solved the atomic structure of icosahedral ScZn7.33 including the characteristic imperfections.
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Affiliation(s)
- Tsutomu Ishimasa
- Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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