Fe deposition on Pt(1 1 1): A route to Fe-containing Pt-Fe alloy surfaces

Dmitri I. Jerdev, Bruce E. Koel

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

Bimetallic surfaces formed by the evaporation of Fe onto a Pt(1 1 1) single crystal at 350 K in ultrahigh vacuum were examined by X-ray electron spectroscopy, low energy electron diffraction (LEED), and low energy ion scattering. Some alloying occurs upon deposition, but heating thick Fe films to 600-850 K causes diffusion of Fe into the near-surface region and forms an alloy layer at the surface which contains 0.5-ML Fe. Annealing to 750 K orders the alloy and results in formation of a diffuse 2 × 2 LEED pattern. This procedure produces Fe-containing alloy surfaces that are more thermally stable against Pt surface segregation than expected from the behavior of Pt80Fe20(1 1 1) bulk crystals, and significant amounts of Fe are stabilized in the surface layer until temperatures as high as 950 K. Alloying with Fe causes a +0.40-eV chemical shift in the Pt(4f7/2) peak, but no chemical shift of the Fe(3d5/2) peak in the bulk of the crystal.

Original languageEnglish (US)
JournalSurface Science
Volume513
Issue number1
DOIs
StatePublished - Jul 1 2002

All Science Journal Classification (ASJC) codes

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

Keywords

  • Alloys
  • Iron
  • Low energy electron diffraction (LEED)
  • Low energy ion scattering (LEIS)
  • Metallic surfaces
  • Platinum
  • X-ray photoelectron spectroscopy

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