Segregation induced reconstructions of Li-Al(110) alloy surface

Abstract

The surface segregation of Li in Al(110)-12.7at%Li alloy and simultaneous reconstructions are investigated using Auger electron spectroscopy and low energy electron diffraction. The measured diffusion coefficient and barrier energy of Li segregation to the alloy surface was close to that of a bulk one. The saturation coverage of Li was close to 1 monolayer, that is, the ratio of the atomic number of Li to Al is 1:1 after heat treatment. Based on the measurement of the surface Li coverages for the c(2 x 2) and (2 x 1) surface reconstructions, we suggest possible model structures. (C) 1997 Elsevier Science B.V.