Order-Disorder Transformations in Chemisorbed Layers: Oxygen on W(110).

Abstract

Order-disorder transformation in oxygen adsorbed on W(110) was investigated. An analysis of the ordering at T=0 using the lattice gas formalism shows that there must be significant three-particle interactions to break the particle-hole symmetry. This is necessary since there is a p(2x2) phase at three-quarter coverage which is not present at one-quarter coverage. Monte Carlo techniques are used to obtain estimates of the strength of the two and three-particle interactions by matching calculated and measured LEED intensity curves. The qualitative characteristics of the phase diagram are discussed with emphasis on the multicritical points which must be present if the transition at half coverage is second order. Evidence in support of a second order transition is reviewed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 13, 1978
Accession Number
ADA058623

Entities

People

  • D. L. Huber
  • G. C. Wang
  • M. G. Lagally
  • W. Y. Ching

Organizations

  • University of Wisconsin–Madison

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Asymmetry
  • Coherent Scattering
  • Diagrams
  • Diffraction
  • Electron Diffraction
  • Equations
  • Materials
  • Materials Science
  • Military Research
  • Order Disorder Transformations
  • Phase Diagrams
  • Phase Transformations
  • Scattering
  • Symmetry
  • Transition Temperature
  • Transitions
  • Wisconsin

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Phased Array Antenna Design.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.