Photoemission studies of an AlLi binary alloy
| Autor: | F.J. Esposto, D.T. Jiang, R.S. Timsit, Peter R. Norton |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Chemistry
Binding energy Analytical chemistry Synchrotron radiation chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Oxygen Surfaces Coatings and Films Metal Crystallography X-ray photoelectron spectroscopy Aluminium visual_art Materials Chemistry visual_art.visual_art_medium Reactivity (chemistry) Lithium |
| Zdroj: | Surface Science. 384:52-61 |
| ISSN: | 0039-6028 |
| Popis: | The surface segregation of Li and the oxidation of a (111) oriented Al-6.5at.%Li binary alloy were studied by synchrotron radiation photoemission. Oxidation of the non-segregated surface leads to four peaks shifted to higher b.e. than metallic aluminium, plus a fifth peak shifted to lower b.e., in addition to the metallic peak in the Al 2p region. The Li 1s and Al 2p regions indicate that oxygen reacts first with Li, then with both Li and Al, in agreement with earlier studies. The reactivity of the segregated surface is enhanced due to the increase in concentration of Li at the surface; here also, four chemically shifted peaks appear simultaneously at low oxygen exposures. In addition to these features, photoemission from the segregated surface reveals an Al 2p component shifted to lower binding energies relative to the bulk aluminium Al 2p metallic emission for both the clean and oxidized surfaces. These low binding energy components have different origins on the clean and oxidized surfaces. |
| Databáze: | OpenAIRE |
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