Competition between Order and Phase Separation in Au-Ni

Journal Article · Fri Dec 02 00:00:00 EST 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.235703· OSTI ID:20699659

Reichert, H; Schoeps, A; Ramsteiner, I B; Bugaev, V N; Shchyglo, O; Udyansky, A ^[1]; Dosch, H ^[1]; Asta, M ^[2]; Drautz, R ^[3]; Honkimaeki, V ^[4]

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1. Max-Planck-Institut fuer Metallforschung, Heisenbergstrasse 3, D-70569 Stuttgart (Germany)
2. Northwestern University, Evanston, Illinois 60208 (United States)
3. Department of Materials, University of Oxford, Oxford OX1 3PH (United Kingdom)
4. European Synchrotron Radiation Facility, F-38043 Grenoble (France)

We have measured and theoretically analyzed the diffuse scattering in the binary alloy system Au-Ni, which has been proposed as a testing ground for theories of alloy phase stability. We found strong evidence that in the alloys Au{sub 3}Ni and Au{sub 3}Ni{sub 2}, fluctuations of both ordering- and clustering-type are competing with each other. Our results resolve a long-standing controversy on the balance of relaxation and mixing energies in this alloy system and explain recent findings of ordering in thin Au-Ni films.

• OSTI ID: 20699659
• Journal Information: Physical Review Letters, Vol. 95, Issue 23; Other Information: DOI: 10.1103/PhysRevLett.95.235703; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BINARY ALLOY SYSTEMS
DIFFUSE SCATTERING
GOLD ALLOYS
NICKEL ALLOYS
ORDER-DISORDER TRANSFORMATIONS
PHASE STABILITY
X-RAY DIFFRACTION