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The Atomic Structure Of The Zn-Mg-Rare-Earth Quasicrystals Studied By High-Resolution Electron Microscopy

Published online by Cambridge University Press:  10 February 2011

Eiji Abe  and
An Pang Tsai
Eiji Abe
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba 305, JAPAN, abe@tamamori.nrim.go.jp
An Pang Tsai
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba 305, JAPAN, abe@tamamori.nrim.go.jp
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Abstract

High-resolution transmission electron microscopy has been applied to study the real atomic structure of the decagonal (d-) quasicrystal in the Zn-Mg-rare-earth (RE) system, which is the first d-phase based on Frank-Kasper phase. We show that the phase has a novel structure in which the atomic arrangement in the tenfold symmetry plane can simply be interpreted as the Penrose tiling decorated by individual atoms - the simplest realization of the Penrose tiling as a real atomic structure. This is supported by the fact that a similar local atomic configuration exists in the Zn7Mg4 crystal structure. This simple structural model is in sharp contras to the idea of atomic clusters, which has been successfully used to describe the structure of quasicrystals in Altransition metal alloys. The present results strongly suggest that the symmetric atomic clusters are not an essential factor for formation of quasicrystals. Instead, a new idea of quasi-unit-cell and its covering is applied for structural description. The atomic structure of the Zn-Mg-RE icosahedral phase is also implied to follow the present concept, based on the fact that its related crystalline phases with hexagonal lattices are not built of giant atomic clusters with icosahedral symmetry.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 123
Copyright
Copyright © Materials Research Society 1999

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