Mean surface phonon dispersion curves for low index fcc (Ac/B1 - c)1B(klm) surface alloys

H. Grimech, A. Khater

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Abstract

A theoretical formalism for calculating the mean surface phonon dispersion curves for surface alloy systems (AcB1 - c)1/B(klm) is developed, using the matching method and an effective field approach. Numerical results which are presented for the (100), (110), and (111) surfaces of the (PtcCu1 - c)1/Cu(klm) system are, however, carried out within t virtual crystal approximation which is described by random distributions of Pt atoms. In this approximation short range disorder effects are not predicted. Significant shifts of surface dispersion branches are found, as functions of the defect concentration c (0 ≤ c ≤ 1), that would be measurable within instrumental resolution of EELS and HAS. Thus, the fit of the calculated branches to the experimental data, in particular for small wavevectors, would lead to information concerning the values of the defect crystal interaction parameters.

Original languageEnglish
Pages (from-to)227-240
Number of pages14
JournalSurface Science
Volume341
Issue number3
DOIs
Publication statusPublished - 10 Nov 1995
Externally publishedYes

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Keywords

  • Phonons
  • Surface defects
  • Surface waves

ASJC Scopus subject areas

  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry

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