Unusual Multilayer Surface Alloy: Al(100)-c(2 x 2)-2Li.
An unusual multilayer surface alloy is formed by adsorption of one monolayer Li on Al(100). It is shown by low energy electron diffraction that the first three layers consist of a mixed Al-Li layer, a pure Al layer, and a second Al-Li layer. Thus the alloy has the same layer stoichiometry as the (100) surface of the metastable Al(3)Li bulk alloy. However, the relative orientation of the two mixed layers is the same as that in the Al(3)Ti-type structure. These findings are confirmed by total-energy calculations, which lead further to the prediction that the bulk Al(3)Li alloy has a faulted, Al(3)Ti-type surface.
Mikkelsen
A
A
Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
Borg
M
M
Petersen
J H
JH
Andersen
J N
JN
Adams
D L
DL