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Title: Phase stability, ordering tendencies, and magnetism in single-phase fcc Au-Fe nanoalloys

Journal Article · · Physical Review B
 [1];  [2];  [1]; ORCiD logo [1]
  1. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy, Nebraska Center for Materials and Nanoscience
  2. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy, Nebraska Center for Materials and Nanoscience; Intermolecular Inc., San Jose, CA (United States)

Bulk Au-Fe alloys separate into Au-based fcc and Fe-based bcc phases, but L10 and L12 orderings were reported in single-phase Au-Fe nanoparticles. Motivated by these observations, we study the structural and ordering energetics in this alloy by combining density functional theory (DFT) calculations with effective Hamiltonian techniques: a cluster expansion with structural filters, and the configuration-dependent lattice deformation model. The phase separation tendency in Au-Fe persists even if the fcc-bcc decomposition is suppressed. The relative stability of disordered bcc and fcc phases observed in nanoparticles is reproduced, but the fully ordered L10 AuFe, L12 Au3Fe, and L12 AuFe3 structures are unstable in DFT. But, a tendency to form concentration waves at the corresponding [001] ordering vector is revealed in nearly-random alloys in a certain range of concentrations. Furthermore, this incipient ordering requires enrichment by Fe relative to the equiatomic composition, which may occur in the core of a nanoparticle due to the segregation of Au to the surface. Effects of magnetism on the chemical ordering are also discussed.

Research Organization:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001269
OSTI ID:
1399581
Alternate ID(s):
OSTI ID: 1399641
Journal Information:
Physical Review B, Vol. 96, Issue 13; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Synthesis of Metastable Au-Fe Alloy Using Ordered Nanoporous Silica as a Hard Template journal December 2017