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Dodecagonal quasicrystal in Mn-based quaternary alloys containing Cr, Ni and Si

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Title: Dodecagonal quasicrystal in Mn-based quaternary alloys containing Cr, Ni and Si
Authors: Iwami, Shuhei Browse this author
Ishimasa, Tsutomu Browse this author
Keywords: quasicrystal
Mn-based alloy
triangle-square tiling
Issue Date: 4-Apr-2015
Publisher: Taylor & Francis
Journal Title: Philosophical magazine letters
Volume: 95
Issue: 4
Start Page: 229
End Page: 236
Publisher DOI: 10.1080/09500839.2015.1038332
Abstract: A dodecagonal quasicrystal showing 12-fold symmetry forms in Mn-rich quaternary alloys containing 5.5 or 7.5at.% Cr, 5.0at.% Ni and 17.5at.% Si. After annealing at 700 degrees C for 130h, the quasicrystal precipitated in a matrix of beta-Mn-type crystalline phase. The shape of the quasicrystal is needle-like having a length of several tens of micrometres. Electron diffraction as well as powder X-ray diffraction experiments has revealed the following characteristics of the quasicrystal: diffraction symmetry 12/mmm, the presence of systematic extinction for h(1)h(2)h(2)h(1)h(5)-type reflections with odd h(5) index, and then five-dimensional space group P12(6)/mmc. Indexing of the reflections indicated that the dimension of the common edge in the equilateral triangle-square tiling is 4.560 angstrom, and the periodicity is 4.626 angstrom along the 12-fold axis. This is the first example of the dodecagonal quasicrystal synthesized by ordinary metallurgical method in 3-d transition-metal alloys.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Philosophical Magazine Letters on 08 May 2015, available online:
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 石政 勉

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