AN UNEXPECTED SURFACE SEGREGATION PHENOMENON OF GOLD ON THE SURFACE OF A PB(AU) SOLID-SOLUTION

Authors
OUGHADDOU H AUFRAY B BIBERIAN JP BERNARDINI J
Citation
H. Oughaddou et al., AN UNEXPECTED SURFACE SEGREGATION PHENOMENON OF GOLD ON THE SURFACE OF A PB(AU) SOLID-SOLUTION, Surface review and letters, 4(6), 1997, pp. 1139-1141
Citations number
9
Journal title
Surface review and letters → ACNP
ISSN journal
0218625X
Volume
4
Issue
6
Year of publication
1997
Pages
1139 - 1141
Database
ISI
SICI code
0218-625X(1997)4:6<1139:AUSSPO>2.0.ZU;2-O
Abstract
At 260 degrees C, at the surface of a lead-gold (96 . 10(-6) at/at) so lid solution we observe by Auger electron spectroscopy an unexpected s urface equilibrium segregation of gold. A quantitative evaluation of t he Auger data obtained at the end of the segregation kinetics shows th at the segregation of gold is consistent with the formation of a surfa ce alloy with a chemical composition close to AuPb3, with gold atoms s ituated under a layer of lead. We propose that this unusual segregatio n is related to the lower surface energy of this intermetallic compoun d AuPb3 compared to the gold and lead ones.