Structural model for the Al{sub 72}Ni{sub 20}Co{sub 8} decagonal quasicrystals

Journal Article · Thu Jun 01 00:00:00 EDT 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.61.14291· OSTI ID:20216571

Yan, Yanfa ^[1]; Pennycook, Stephen J ^[2]

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1. National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)
2. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

We propose a structure model for the Al{sub 72}Ni{sub 20}Co{sub 8} decagonal quasicrystals based on its {tau}{sup 2}-inflated Al{sub 13}Co{sub 4} approximant phase: Applying a 10{sub 5} screw operation on a monolayer obtained from the approximant reproduces almost all features of 2-nm clusters seen in atomic-resolution Z-contrast images of Al{sub 72}Ni{sub 20}Co{sub 8} decagonal quasicrystals. The exception is the central ring, where the symmetry is broken due to chemical ordering of Al and transition metals. By restricting possible overlaps, this enforces the perfect quasiperiodic tiling. (c) 2000 The American Physical Society.

• OSTI ID: 20216571
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 61, Issue 21; Other Information: PBD: 1 Jun 2000; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
ALUMINIUM BASE ALLOYS
COBALT ALLOYS
NICKEL ALLOYS
EXPERIMENTAL DATA
THEORETICAL DATA