Oxygen-deficient ordered phases of ultrathin BaTiO3 films on Pt(111)

被引：14
作者：
Foerster, Stefan [1 ]
Meinel, Klaus [1 ]
Schindler, Karl-Michael [1 ]
Widdra, Wolf [1 ,2 ]
机构：
[1] Univ Halle Wittenberg, Inst Phys, Halle, Germany
[2] Max Planck Inst Microstruct Phys, D-06120 Halle, Germany
来源：
SURFACE AND INTERFACE ANALYSIS | 2012年 / 44卷 / 06期
关键词：
surface structure; epitaxial thin films; BaTiO3(111); low-energy electron diffraction (LEED); scanning tunneling microscopy (STM); XPS; SCANNING-TUNNELING-MICROSCOPY; STRONTIUM-TITANATE; SURFACE; SRTIO3; PHOTOEMISSION; SPECTROSCOPY; VACANCIES; MOBILITY; GROWTH;
D O I：
10.1002/sia.4812
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The restructuring of epitaxial ultrathin BaTiO3 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 BaTiO3 films up to 4 monolayer equivalents in thickness at 1150?K in vacuum, BaTiO3 forms three-dimensional islands surrounded by bare Pt. Annealing at 1250?K induces a two-dimensional rewetting layer, which spreads around the three-dimensional BaTiO3 islands. This rewetting layer consists of oxygen-deficient BaTiO3. Within the rewetting layer, several long-range ordered structures coexist. Their lattice constants vary between 11 and 46?angstrom. These rewetting structures are derived from a slightly modified BaTiO3(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 (c) 2012 John Wiley & Sons, Ltd.
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页码：628 / 634
页数：7
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