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Unifying cluster-based structure models of decagonal Al-Co-Ni, Al-Co-Cu and Al-Fe-Ni

The geometrical building principles of Al‐based decagonal quasicrystals and their approximants are discussed from a cluster‐based approach. Our investigations cover 11 modifications with two‐ or four‐layer periodicity in the systems Al–Co–Ni, Al–Co–Cu and Al–Fe–Ni. We identified a cluster that leads...

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Bibliographic Details
Published in:Acta crystallographica. Section B, Structural science Structural science, 2011-02, Vol.67 (1), p.1-17
Main Authors: Deloudi, Sofia, Fleischer, Frank, Steurer, Walter
Format: Article
Language:English
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Summary:The geometrical building principles of Al‐based decagonal quasicrystals and their approximants are discussed from a cluster‐based approach. Our investigations cover 11 modifications with two‐ or four‐layer periodicity in the systems Al–Co–Ni, Al–Co–Cu and Al–Fe–Ni. We identified a cluster that leads to a unifying view of all these phases. This unit cluster has ∼ 20 Å diameter, four‐layer periodicity along its tenfold axis and rod symmetry group . The models obtained are in agreement with all the electron‐density maps and electron‐microscopy images available.
ISSN:0108-7681
2052-5192
1600-5740
2052-5206
DOI:10.1107/S0108768110040942