Properties of an electrochemically deposited Pb monolayer on Cu(111)

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.7945· OSTI ID:535722

Chu, Y S; Robinson, I K ^[1]; Gewirth, A A ^[2]

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1. Department of Physics, University of Illinois, Urbana, Illinois 61801 (United States)
2. Department of Chemistry, University of Illinois, Urbana, Illinois, 61801 (United States)

The structure of the electrochemically deposited Pb monolayer on Cu(111) in 0.1M HClO{sub 4} was studied using {ital in situ} surface x-ray diffraction. The Pb monolayer forms an unrotated incommensurate hexagonal structure. The nearest-neighbor spacing of the Pb monolayer compresses continuously from 1.4{percent} to 3.2{percent} of the bulk spacing as the electrode potential is varied, with no apparent tendency to lock in. The measured isothermal two-dimensional (2D) compressibility of the Pb monolayer, 0.95{plus_minus}0.07 {Angstrom}{sup 2}/eV, is in good agreement with the value expected from the 2D free-electron gas model. The surface normal structure of the Pb monolayer on Cu(111) was studied using reflectivity measurements. Fitting analysis based on a layered model revealed a contracted Pb-Cu spacing and an expanded topmost Cu layer. Unlike the in-plane structure, the surface normal structure showed little potential dependence. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Brookhaven National Laboratory
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 535722
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 12 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
COMPRESSIBILITY
COPPER
CRYSTAL STRUCTURE
ELECTROCHEMICAL COATING
ELECTRODES
HEXAGONAL LATTICES
LATTICE PARAMETERS
LEAD
REFLECTION
SPECTROSCOPY
STRAINS
SURFACE ENERGY
THERMODYNAMICS
X-RAY DIFFRACTION
free-electron approximation