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Structural Phase Transitions Of Decagonal Quasicrystals

Published online by Cambridge University Press:  10 February 2011

W. Steurer
W. Steurer*
Affiliation:
Laboratory of Crystallography, Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland, steurer@kristall.erdw.ethz.ch
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Abstract

A two step model for the transformation of decagonal quasicrystals (DQC) to their crystalline approximants is presented. First, a partially disordered approximant domain structure results rapidly from small atomic displacements. Subsequently, atomic diffusion leads very slowly to an ordered approximant crystal (AC) structure. The model is discussed on atomic scale. Its basic idea is to describe the structure of a quasicrystal (QC) as incommensurately modulated structure (IMS). In that description, the average structure (AS) of a QC is at the same time the AS of all its irrational and rational approximants. In this approach, the positional quasicrystal- to-approximant-crystal (QC-AC) transformation can be performed by atomic displacements smaller than any interatomic distance. This mechanism, however, leads inherently to to a certain amount of chemical disorder. In most cases also some positional disorder will result. The tools developed for the description of phase transitions of IMS can analogously be used for QC. Examples for one- and two-dimensional quasiperiodic structures are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 159
Copyright
Copyright © Materials Research Society 1999

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References

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