Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 95: Metal Substrates: Adsorption of Atoms and Inorganic Molecules
O 95.8: Vortrag
Donnerstag, 23. März 2017, 17:00–17:15, WIL A317
Oxidation of the Zr(0001) Surface — Peter Lackner1, Wen Ma2, Bilge Yildiz2, Ulrike Diebold1, and •Michael Schmid1 — 1Institute of Applied Physics, TU Wien, Vienna, Austria — 2Dept. of Nuclear Science & Engineering, Massachusetts Institute of Technology, USA
The first stages of oxidation of Zr(0001) were studied by scanning tunneling microscopy (STM) and x-ray photoelectron spectroscopy (XPS). Dosing oxygen at room-temperature does not lead to ordered structures. Upon annealing to ≈ 550 ∘C, we observe two types of ordered phases. The first one shows a hexagonal lattice with an in-plane lattice parameter of 331 pm, significantly smaller than bulklike ZrO2(111) (≈ 361 pm) and the ultrathin ZrO2(111) films obtained by oxidation of Zr alloys (≈ 350 pm, Refs. [1,2]). The second phase exhibits a moiré structure perfectly fitting a ZrO2(100) lattice on the Zr substrate. Previous studies of ultrathin ZrO2 films created by reactive deposition of Zr [3] and oxidation of Zr alloys [1,2] have always resulted in the non-polar ZrO2(111) orientation, which has the lowest surface energy [4]. To our knowledge, this is the first atomic-scale observation of a ZrO2(100) surface, opening new possibilities for studying this technologically important material.
[1] Antlanger et al., Phys. Rev. B 86, 035451 (2012).
[2] Choi et al., J. Phys.: Condens. Matter 26, 225003 (2014).
[3] Meinel et al., Phys. Rev. B 74, 235444 (2006) and Refs. therein.
[4] Christensen & Carter, Phys. Rev. B 58, 8050 (1998).