6533b86ffe1ef96bd12cd4fa
RESEARCH PRODUCT
Chemical surface ageing in ambient conditions of an Al–Fe–Cr approximant phase.
Bruno DomenichiniD. VeysVincent FournéeSylvain WeberP WeisbeckerJ. M. Duboissubject
Photoemission spectroscopyAlloyAnalytical chemistryOxidechemistry.chemical_element02 engineering and technologySubstrate (electronics)engineering.material010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciences0104 chemical sciencesAmorphous solidCrystallographychemistry.chemical_compoundchemistryAluminiumPhase (matter)engineeringGeneral Materials Science0210 nano-technologyLayer (electronics)description
International audience; The γ -Al65Cr27Fe8 phase is a complex metallic alloy with interesting electrochemical properties. Here we present a detailed study of the surface ageing of this alloy when exposed to ambient conditions for a long time. A combination of x-ray reflectivity, photoemission spectroscopy and secondary neutral mass spectroscopy measurements is used to provide a model of the modification of the surface structure and its composition as functions of ageing time. The near surface structure is described by the stacking of three layers. The first layer on top of the substrate corresponds to a mixed metal oxide and is amorphous. The intermediate layer consists of pure aluminum oxy-hydroxide while the outermost layer corresponds to carbonated contaminations. The total thickness of this near-surface region evolves with ageing time, reaching a stable state only after several days.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-08-22 |