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Metastable Al-Fe intermetallic stabilised by epitaxial relationship
- Source :
- Applied Surface Science, Applied Surface Science, Elsevier, 2020, 533, pp.147492. ⟨10.1016/j.apsusc.2020.147492⟩
- Publication Year :
- 2020
- Publisher :
- HAL CCSD, 2020.
-
Abstract
- We report the adsorption of Fe for several dosing conditions on Al(1 0 0) surface held at different temperatures. For 2 monolayer equivalent of Fe deposited on the substrate held at 593 K, we observe two rotational domains of a ( 5 × 5 )R26.6° structure by low energy electron diffraction and scanning tunneling microscopy. We identify this structure as the formation of the metastable Al9Fe2 intermetallic phase. The segregation energy and the structural stability of this intermetallic has been analysed using density functional theory based calculations. We propose that the formation of the Al9Fe2(0 0 1) metastable phase at the expense of other thermodynamically stable Al-Fe compounds, relies on a specific structural similarity between pure Al (0 0 1) planes of the intermetallic and Al(1 0 0) layers. These ‘common’ planes lead to the epitaxial relationship (1 0 0)Al [0 0 1]Al ∥ ( 0 0 1 ) Al 9 Fe 2 [ 1 3 ¯ 0 ] Al 9 Fe 2 . The Al9Fe2-Al matrix interface is sharp as revealed by transmission electron microscopy measurements.
- Subjects :
- Materials science
Low-energy electron diffraction
Intermetallic
General Physics and Astronomy
02 engineering and technology
Surfaces and Interfaces
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Epitaxy
01 natural sciences
0104 chemical sciences
Surfaces, Coatings and Films
law.invention
Crystallography
law
Transmission electron microscopy
Phase (matter)
Monolayer
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Density functional theory
Scanning tunneling microscope
0210 nano-technology
Subjects
Details
- Language :
- English
- ISSN :
- 01694332
- Database :
- OpenAIRE
- Journal :
- Applied Surface Science, Applied Surface Science, Elsevier, 2020, 533, pp.147492. ⟨10.1016/j.apsusc.2020.147492⟩
- Accession number :
- edsair.doi.dedup.....88f175653bebfb1301794d23dac13849