skip to main content

DOE PAGESDOE PAGES

Title: Vacancy-mediated fcc/bcc phase separation in Fe 1-xNi x ultrathin films

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.
Authors:
 [1] ;  [2] ;  [3] ; ;  [4] ;  [1]
  1. Elettra-Sincrotrone Trieste (Italy)
  2. Abdus Salam International Centre for Theoretical Physics, Trieste (Italy); IOM-CNR Democtrios, Trieste (Italy)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
  4. Synchrotron Soleil, Gif-sur-Yvette (France)
Publication Date:
Report Number(s):
BNL-113254-2016-JA
Journal ID: ISSN 2469-9950; TRN: US1701751
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1340413