The Oxide at the Al-rich Fe 0.85 Al 0.15 ( 110 ) surface - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Materials Année : 2020

The Oxide at the Al-rich Fe 0.85 Al 0.15 ( 110 ) surface

Gilles Renaud

Résumé

The formation of an ultra-thin aluminum oxide film at Fe0.85Al0.15(110) surface (A2 random alloy) has been studied by a variety of surface sensitive techniques (X-ray photoemission, low-energy electron diffraction, surface X-ray diffraction and scanning tunneling microscopy) supplemented by ab initio atomistic simulations. Since iron is not oxidized in the used conditions, the study focused on the coupling between aluminum oxidation and segregation processes. Compared to the bare surface, whose average composition (Fe0.6Al0.4) is closer to the B2-CsCl structure over a ∼ 3 nm depth, the oxidation hardly affects the subsurface segregation of aluminum. All the structural and chemical fingerprints point to an oxide film similar to that found on NiAl(110). It is a bilayer (∼ 7.5Å thick) with a composition close to Al10O13 and a large (18.8 × 10.7)Å 2 nearly rectangular unit cell; an almost perfect match between substrate periodicity and the (1 × 2) oxide supercell is found. Nevertheless, microscopy reveals the presence of anti-phase domain boundaries. Measured Al 2p and O 1s core level shifts match calculated ones; their origin and the relative contributions of initial/final state effects are discussed. The ubiquity of the present oxide on different supports asks for the origin of its stability.
Fichier principal
Vignette du fichier
Feal_oxide_110_v11.pdf (3.85 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02928089 , version 1 (02-09-2020)

Identifiants

Citer

Zongbei Dai, Natalia Alyabyeva, Maxime van den Bossche, Patrizia Borghetti, Stéphane Chenot, et al.. The Oxide at the Al-rich Fe 0.85 Al 0.15 ( 110 ) surface. Physical Review Materials, 2020, 4 (7), ⟨10.1103/PhysRevMaterials.4.074409⟩. ⟨hal-02928089⟩
93 Consultations
80 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More