Adsorption of Al, O, Hf, Y, Pt, and S atoms on α-Al2O 3(0001)

Berit Hinnemann, Emily A. Carter

Research output: Contribution to journalArticle

95 Scopus citations

Abstract

We use first-principles density functional theory to investigate adsorption of Al, O, Hf, Y, Pt, and S-atoms on the α-Al2O 3(0001) surface. We identify stable adsorption sites and predict binding energies and structures. We find that Al, Hf, and Y preferentially adsorb on threefold-hollow sites, transfer electrons to the surface, and form ionic bonds to the three oxygen atoms. In contrast, the most stable adsorption site for Pt and S is ontop an oxygen atom, and we do not observe significant charge transfer. We find a binding order of S < Pt < O < Al ≪Y < Hf, which reflects both the ease with which the early transition metals Hf and Y ionize, as well as the (nearly) closed-shell repulsions influencing the adsorption of O, Pt, and S. We use these results to rationalize some observations regarding the stability of thermal barrier coatings.

Original languageEnglish (US)
Pages (from-to)7105-7126
Number of pages22
JournalJournal of Physical Chemistry C
Volume111
Issue number19
DOIs
StatePublished - May 17 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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