Grazing Incidence X-Ray Diffraction of Lead Monolayers at a Silver (111) and Gold (111) Electrode/Electrolyte Interface.
Interim technical rept.,
PUERTO RICO UNIV RIO PIEDRAS DEPT OF PHYSICS
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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 LeadMetal Gold electrode Interface structure Electrodeposition.
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