Abstract
Optical second harmonic generation is used in conjunction with Auger electron spectroscopy to study the evolution with temperature T of oxygen adsorbed at 320 K on the clean, annealed (211) surface of an Al–Li alloy with a bulk Li concentration of 6.5 at. %. The oxygen is chemically bonded to form an oxide. The presence of Li at the clean alloy surface increases the rate of oxygen adsorption by a factor of ∼60 relative to pure Al. The oxygen chemisorption rate is consistent with a sticking coefficient of 1 for O2 on the clean unoxidized surface. For all oxygen exposures, the surface oxide film that is formed undergoes two distinct transformations. A structural transformation occurs between T=450 K and T=860 K, depending on oxygen exposure. This transformation exposes bare Al. Between 860 and 905 K, Li diffuses rapidly to the surface, thus increasing the surface concentration of elemental Li, and the remaining surface oxide becomes predominantly Li2O.
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Schedule a callMore From: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
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