Vacancy-mediated fcc/bcc phase separation in Fe1-xNix ultrathin films

Mentes, T. O.; Stojic, N.; Vescovo, E.; Ablett, J. M.; Nino, M. A.; Locatelli, A.

doi:10.1103/PhysRevB.94.085402

Title: Vacancy-mediated fcc/bcc phase separation in Fe_1-xNi_x ultrathin films

Journal Article · Mon Aug 01 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.085402· OSTI ID:1340413

Mentes, T. O. ^[1]; Stojic, N. ^[2]; Vescovo, E. ^[3]; Ablett, J. M.; Nino, M. A. ^[4]; Locatelli, A. ^[1]

Elettra-Sincrotrone Trieste (Italy)
Abdus Salam International Centre for Theoretical Physics, Trieste (Italy); IOM-CNR Democtrios, Trieste (Italy)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
Synchrotron Soleil, Gif-sur-Yvette (France)

The phase separation occurring in Fe-Ni thin lms near the Invar composition is studied by using high resolution spectromicroscopy techniques and density functional theory calculations. Annealed at temperatures around 300 C, Fe_0.70Ni_0.30 lms on W(110) break into micron-sized bcc and fcc domains with compositions in agreement with the bulk Fe-Ni phase diagram. Ni is found to be the di using species in forming the chemical heterogeneity. The experimentally-determined energy barrier of 1.59 0.09 eV is identi ed as the vacancy formation energy via density functional theory calculations. Thus, the principal role of the surface in the phase separation process is attributed to vacancy creation without interstitials.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704

OSTI ID:: 1340413

Report Number(s):: BNL-113254-2016-JA; TRN: US1701751

Journal Information:: Physical Review B, Vol. 94; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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