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Modulated‐Crystal Model for the Twelvefold Quasicrystal Ta 62 Te 38
Author(s) -
Uchida M.,
Horiuchi S.
Publication year - 1998
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889898003008
Subject(s) - quasicrystal , transmission electron microscopy , electron diffraction , modulation (music) , crystal (programming language) , electron microscope , diffraction , resolution (logic) , crystallography , condensed matter physics , charge density wave , electron , materials science , chemistry , molecular physics , physics , optics , superconductivity , quantum mechanics , programming language , artificial intelligence , computer science , acoustics
A transmission electron microscopy study reveals that the so‐called twelvefold quasicrystal Ta 62 Te 38 is a crystal subjected to structure modulation. It is composed of two incommensurate layers rotated by 30° to each other about their normal. High‐resolution electron microscope images show the formation of commensurate domains and their discommensuration. The observed electron diffraction patterns may be explained by a kinematical calculation for the commensurate cell, designated as a 7 × 7 cell. The modulation is considered to be due to the rearrangement of atomic vacancies in response to the occurrence of charge‐density waves.