Disorder and complexity in the atomic structure of the perfect icosahedral alloy of Al-Pd-Mn

Journal Article · Mon May 30 00:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.3538· OSTI ID:7233716

de Boissieu, M; Stephens, P ^[1]; Boudard, M; Janot, C ^[2]; Chapman, D L ^[3]; Audier, M ^[4]

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1. Department of Physics, State University of New York, Stony Brook, New York 11794 (United States)
2. Institut Laue Langevin, Boite Postale 156, 38042 Grenoble Cedex 9 (France)
3. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)
4. Laboratoire de Thermodynamique et Physico-Chimie Metallurgique, Boite Postale 75, 38402 Saint Martin d'Heres Cedex (France)

The atomic structure of the perfect Al-Pd-Mn icosahedral phase has been studied on single grain samples. Using anomalous x-ray diffraction close to the Pd edge, the partial structure factor [ital F][sub Pd] has been extracted. In the six-dimensional description of its structure, we find that the atomic surface cannot be described by an object with a sharp boundary. A phason Debye-Waller term has been introduced to fully account for the data. It is interpreted as resulting from random phason disorder and nonsphericity of the atomic surfaces.

• DOE Contract Number: FG02-86ER45231
• OSTI ID: 7233716
• Journal Information: Physical Review Letters; (United States), Vol. 72:22; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
STRUCTURE FACTORS
MANGANESE ALLOYS
PALLADIUM ALLOYS
DEBYE-WALLER FACTOR
ELECTRONIC STRUCTURE
TERNARY ALLOY SYSTEMS
X-RAY SPECTRA
ALLOY SYSTEMS
ALLOYS
PLATINUM METAL ALLOYS
SPECTRA
360102* - Metals & Alloys- Structure & Phase Studies