First-principles modeling of metal layer adsorption on CaF2(1 1 1)

S. Barzilai, N. Argaman, N. Froumin, D. Fuks, N. Frage

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Recently, an unusual wetting enhancement was observed for the CaF2/(In-Ti) and CaF2/(Cu-Ti) systems. This enhancement cannot be attributed to a chemical reaction between the melt and the substrate, but may occur due to the dissimilarity of the adsorption of the metallic atoms to the substrate. In the present study, ab initio simulations of adsorption of one monolayer of various metal (Me) atoms on the CaF2(1 1 1) surface have been performed for three different atomic sites, in order to understand the nature of the wetting enhancement, to find the reason for the adsorption dissimilarity and to predict other systems that can wet this compound. Each adsorption site was modeled using a periodic two-dimensional slab, a vacuum separation, and a Me layer at a distance of 1-4 Å from the surface. An attractive adsorption is obtained only when the Me adsorbs above the terminal F atoms. When transition metals with partly occupied d-states are adsorbed on CaF2, a relatively high electron density is observed in the Me-F bonds, and the local density of states exhibits high peaks in the vicinity of the Fermi energy. This is reflected by the high adsorption energy of these atoms, which may serve as an important detail in understanding the wetting enhancement.

Original languageEnglish
Pages (from-to)1517-1524
Number of pages8
JournalSurface Science
Volume602
Issue number8
DOIs
StatePublished - 15 Apr 2008

Keywords

  • Ab initio calculations
  • Adsorption
  • CaF
  • Slab
  • Wetting

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'First-principles modeling of metal layer adsorption on CaF2(1 1 1)'. Together they form a unique fingerprint.

Cite this