Accession Number : ADA181046

Title :   Grazing Incidence X-Ray Diffraction of Lead Monolayers at a Silver (111) and Gold (111) Electrode/Electrolyte Interface.

Descriptive Note : Interim technical rept.,

Corporate Author : PUERTO RICO UNIV RIO PIEDRAS DEPT OF PHYSICS

Personal Author(s) : Samant,Mahesh G ; Toney,Michael F ; Borges,Gary L ; Blum,Lesser ; Melroy,Owen R

PDF Url : ADA181046

Report Date : 12 May 1987

Pagination or Media Count : 40

Abstract : Using grazing incidence geometry and a thin layer cell, x-ray scattering has been used to study the structure of electrochemically deposited monolayers of lead on silver (111) and gold (111) electrodes in-situ. For the lead monolayer deposited on sliver, the lead was found to order in a hexagonoal closed packed (hcp) geometry with the lead lattice compresssed 1.2% relative to bulk lead. A rotational epitaxy angle of 4.4 deg was observed. From the width of the first order diffraction peak, the domain size of the lead was determined to be 300 A indicating that even when deposited from a solution, the lead forms a well ordered two-dimensional solid. On a gold (111) substrate, the lead monolayer was again found to order into a hcp layer, incommensurate with the gold. The lead was compressed 0.7% relative to bulk lead, with a domain size 200 A. Keywords: X-ray electrode; Lead(Metal); Gold electrode; Interface structure; Electrodeposition.

Descriptors :   *ELECTRODES, *ELECTRODEPOSITION, DEPOSITION, LAYERS, ELECTROLYTES, INTERFACES, GOLD, GRAZING, X RAY DIFFRACTION, ANGLES, SIZES(DIMENSIONS), DIFFRACTION, PEAK VALUES, GEOMETRY, INTERFACES, SILVER, EPITAXIAL GROWTH, ROTATION, SUBSTRATES, SOLIDS, TWO DIMENSIONAL, X RAY SCATTERING, CELLS, THINNESS, X RAYS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE