Step structure on the fivefold Al-Pd-Mn quasicrystal surface, and on related surfaces

J Ledieu, E J Cox, R McGrath, N V Richardson, Q Chen, V Fournee, T A Lograsso, A R Ross, K J Caspersen, B Unal, J W Evans, P A Thiel

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

We compare step morphologies on surfaces of Al-rich metallic alloys, both quasicrystalline and crystalline. We present evidence that the large-scale step structure observed on Al-rich quasicrystals after quenching to room temperature reflects equilibrium structure at an elevated temperature. These steps are relatively rough, i.e., have high diffusivity, compared to those on crystalline surfaces. For the fivefold quasicrystal surface, step diffusivity increases as step height decreases, but this trend is not obeyed in a broader comparison between quasicrystals and crystals. On a shorter scale, the steps on Al-rich alloys tend to exhibit local facets (short linear segments), with different facet lengths, a feature which could develop during quenching to room temperature. Facets are shortest and most difficult to identify for the fivefold quasicrystal surface. (c) 2005 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)415
Number of pages12
JournalSurface Science
Volume583
DOIs
Publication statusPublished - 20 May 2005

Keywords

  • equilibrium thermodynamics and statistical mechanics
  • scanning tunneling microscopy (STM)
  • step formation and bunching
  • alloys
  • stepped single crystal surfaces
  • ENERGY-ELECTRON DIFFRACTION
  • ALPDMN
  • LEED
  • AL70PD21MN9
  • AL68PD23MN9
  • DYNAMICS
  • STM
  • TEMPERATURE
  • MICROSCOPY
  • AG(111)

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