In-Situ Surface X-Ray Scattering Measurements of Electrochemically Deposited Bismuth on Silver (III): Structure, Compressibility, and Comparison with Ex-Situ Leed Measurements

Abstract

We report in-situ surface X-ray scattering measurements of the structure and compressibility of electrochemically deposited Bi monolayers on Ag(III) and compare the in-situ structure with results from previous ex-situ experiments on emersed electrodes, where the structure was studied with low- energy diffraction (LEED). We find that the Bi monolayer forms an unusual structure: a two-dimensional rectangular lattice is uniaxially commensurate with the hexagonal Ag (III) surface along the Ag211 direction. There are two Bi adatoms per rectangular unit cell and one adatom is displaced from the centered- rectangular position by approx. 0.25a along the commensurate direction. The displacement shortens two of the Bi-Bi near-neighbor bond distances but lengthens two others and may reflect the tendency toward covalent bonding in Bi. With increasing coverage (Decreasing applied potential), the Bi monolayer compresses uniaxially along the incommensurate direction (Ag011, which preserves the uniaxially commensurate structure.

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Document Details

Document Type
Technical Report
Publication Date
Jan 29, 1991
Accession Number
ADA232624

Entities

People

  • David G. Wiesler
  • Gary L. Borges
  • Joseph G. Gordon
  • Mahesh G. Samant
  • Michael F. Toney

Organizations

  • University of Puerto Rico

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • California
  • Chemical Reactions
  • Chemistry
  • Diffraction
  • Distortion
  • Electrodeposition
  • Electron Energy
  • Materials Science
  • Measurement
  • Military Research
  • Physics
  • Scattering
  • Two Dimensional
  • United States
  • X Ray Scattering
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Thin Film Deposition Science.