Atomic Structure of a Spinel-like Transition Al2O3 (100) Surface

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  • Thomas Nørregaard Jensen, Denmark
  • Kristoffer Meinander, Denmark
  • Stig Helveg, Haldor Topsøe A/S, Denmark
  • Adam S. Foster, Aalto University, Denmark
  • Sampo Kulju, Tampere University of Technology, Finland
  • Tiziana Musso, Aalto University, Finland
  • Jeppe Vang Lauritsen
We study a crystalline epitaxial alumina thin film with the characteristics of a spinel-type transition Al2O3(100) surface by using atom-resolved noncontact atomic force microscopy and density functional theory. It is shown that the films are terminated by an Al-O layer rich in Al vacancies, exhibiting a strong preference for surface hydroxyl group formation in two configurations. The transition alumina films are crystalline and perfectly stable in ambient atmospheres, a quality which is expected to open the door to new fundamental studies of the surfaces of transition aluminas.
Original languageEnglish
Article number106103
JournalPhysical Review Letters
Publication statusPublished - 4 Sep 2014

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