A density functional theory study of atomic steps on stoichiometric rutile TiO2(110)

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  • Jess Stausholm-Møller
  • ,
  • Henrik Ho̸gh Kristoffersen
  • ,
  • Umberto Martinez, Denmark
  • Bjørk Hammer
We present a detailed theoretical study of the energetics of stoichiometric steps on the (110) surface of rutile TiO2. Step structures running along the 〈001〉, 〈111〉, and 〈110〉 directions including bulk-terminations and possible reconstructions have been considered. A robust method for extracting surface and step energies of vicinal surfaces, where the surface energies converge slowly with respect to slab thickness, is outlined and used. Based on the calculated step energies a 2D Wulff-construction is presented from which it can be concluded that in equilibrium only oxygen terminated steps running along the 〈001〉 directions and reconstructed steps along the 〈111〉 directions should be present. Finally it is found that under conditions of stoichiometry the reconstructed 〈111〉 steps should be more than twice as abundant as oxygen terminated 〈001〉 steps.
Original languageEnglish
JournalJournal of Chemical Physics
Volume139
Issue23
Pages (from-to)234704
ISSN0021-9606
DOIs
Publication statusPublished - 21 Nov 2013

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