Single crystals of TiS2(0001) were intercalated sequentially by Li and Na.
The intercalation occurred across the Van der Waals planes, by deposition o
nto the basal plane of TIS2. The investigation took place in UHV by soft X-
ray photoelectron spectroscopy, Deposition of Na onto Li-intercalated TiS2(
0001) caused the Li to move further into the bulk of the substrate. However
, deposition of Li onto Na-intercalated TiS2(0001) forced Na to move out to
wards the surface by an exchange mechanism. These interactions between inte
rcalated Li and Na into TiS2(0001) and their subsequent behaviour have been
explained by a correlation of thermodynamic (Gibbs free energy), kinetic (
diffusion coefficient) and electrostatic effects. (C) 1999 Elsevier Science
B.V, All rights reserved.