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Oxygen‐deficient ordered phases of ultrathin BaTiO 3 films on Pt(111)
Author(s) -
Förster Stefan,
Meinel Klaus,
Schindler KarlMichael,
Widdra Wolf
Publication year - 2012
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.4812
Subject(s) - annealing (glass) , x ray photoelectron spectroscopy , epitaxy , scanning tunneling microscope , oxygen , monolayer , crystallography , lattice constant , electron diffraction , materials science , low energy electron diffraction , ferroelectricity , lattice (music) , chemistry , diffraction , analytical chemistry (journal) , layer (electronics) , nanotechnology , chemical engineering , optics , composite material , optoelectronics , dielectric , organic chemistry , physics , engineering , acoustics
The restructuring of epitaxial ultrathin BaTiO 3 films on a Pt(111) substrate upon high‐temperature treatment has been studied by scanning tunneling microscopy, low‐energy electron diffraction, and XPS. Upon annealing ultrathin BaTiO 3 films up to 4 monolayer equivalents in thickness at 1150 K in vacuum, BaTiO 3 forms three‐dimensional islands surrounded by bare Pt. Annealing at 1250 K induces a two‐dimensional rewetting layer, which spreads around the three‐dimensional BaTiO 3 islands. This rewetting layer consists of oxygen‐deficient BaTiO 3 . Within the rewetting layer, several long‐range ordered structures coexist. Their lattice constants vary between 11 and 46 Å. These rewetting structures are derived from a slightly modified BaTiO 3 (100) layer, which is stabilized by one direction of the Pt(111) lattice. The rewetting layer formation can be reversed by annealing in oxygen. Copyright © 2012 John Wiley & Sons, Ltd.