Vacancy-mediated fcc/bcc phase separation in Fe1-xNix ultrathin films
Abstract
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, Fe0.70Ni0.30 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:
-
- 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)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1340413
- Report Number(s):
- BNL-113254-2016-JA
Journal ID: ISSN 2469-9950; TRN: US1701751
- Grant/Contract Number:
- SC00112704
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 94; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Mentes, T. O., Stojic, N., Vescovo, E., Ablett, J. M., Nino, M. A., and Locatelli, A. Vacancy-mediated fcc/bcc phase separation in Fe1-xNix ultrathin films. United States: N. p., 2016.
Web. doi:10.1103/PhysRevB.94.085402.
Mentes, T. O., Stojic, N., Vescovo, E., Ablett, J. M., Nino, M. A., & Locatelli, A. Vacancy-mediated fcc/bcc phase separation in Fe1-xNix ultrathin films. United States. https://doi.org/10.1103/PhysRevB.94.085402
Mentes, T. O., Stojic, N., Vescovo, E., Ablett, J. M., Nino, M. A., and Locatelli, A. 2016.
"Vacancy-mediated fcc/bcc phase separation in Fe1-xNix ultrathin films". United States. https://doi.org/10.1103/PhysRevB.94.085402. https://www.osti.gov/servlets/purl/1340413.
@article{osti_1340413,
title = {Vacancy-mediated fcc/bcc phase separation in Fe1-xNix ultrathin films},
author = {Mentes, T. O. and Stojic, N. and Vescovo, E. and Ablett, J. M. and Nino, M. A. and Locatelli, A.},
abstractNote = {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, Fe0.70Ni0.30 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.},
doi = {10.1103/PhysRevB.94.085402},
url = {https://www.osti.gov/biblio/1340413},
journal = {Physical Review B},
issn = {2469-9950},
number = ,
volume = 94,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2016},
month = {Mon Aug 01 00:00:00 EDT 2016}
}
Web of Science
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