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@ARTICLE{Garcia:38552,
author = {Garcia, S. G. and Salinas, D. R. and Staikov, G.},
title = {{U}nderpotential {D}eposition of {C}d on {A}g(111): {A}n in
situ {STM} study},
journal = {Surface science},
volume = {576},
issn = {0039-6028},
address = {Amsterdam},
publisher = {Elsevier},
reportid = {PreJuSER-38552},
pages = {9 - 18},
year = {2005},
note = {Record converted from VDB: 12.11.2012},
abstract = {The kinetics and mechanism of Cd underpotential deposition
(UPD) and involved surface alloy formation processes the
system Ag(1 1 1)/Cd2+,SO42- are studied by means of combined
electrochemical measurements and in situ scanning tunneling
microscopy (STM). The results show that the UPD process
starts with a formation of an expanded (diluted) adlayer
with a superlattice structure Ag(1 1 1)-(root3- x
root19)R23.4degrees. In the underpotential range 50 mV <
DeltaE < 80 mV this adlayer transforms to a condensed close
packed Cd monolayer via a first order phase transition. At
long polarization times the condensed monolayer undergoes
structural changes involving place exchange processes
between Cd atoms and surface Ag atoms. A formation of a
second Cd monolayer and a significant Ag-Cd surface alloying
take place at lower underpotentials (DeltaE < 50 mV). The
kinetics of surface alloying are analyzed on the basis of a
recently proposed diffusion model including a relatively
fast initial formation of a very thin surface alloy film and
a subsequent slow alloy growth controlled by solid state
diffusion. The anodic dealloying results in an appearance of
monatornically deep pits, which disappear quickly at
relatively high underpotentials (DeltaE > 550 mV) indicating
a high mobility of surface Ag atoms. (C) 2004 Elsevier B.V.
All rights reserved.},
keywords = {J (WoSType)},
cin = {ISG-3 / CNI},
ddc = {540},
cid = {I:(DE-Juel1)VDB43 / I:(DE-Juel1)VDB381},
pnm = {Materialien, Prozesse und Bauelemente für die Mikro- und
Nanoelektronik},
pid = {G:(DE-Juel1)FUEK252},
shelfmark = {Chemistry, Physical / Physics, Condensed Matter},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000226872600004},
doi = {10.1016/j.susc.2004.11.037},
url = {https://juser.fz-juelich.de/record/38552},
}