Probing the Electronic Structures of BaTiO3/SrTiO3 Multilayered Film with Spatially Resolved Electron Energy-Loss Spectroscopy

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Title: Probing the Electronic Structures of BaTiO3/SrTiO3 Multilayered Film with Spatially Resolved Electron Energy-Loss Spectroscopy
Authors: Liu, G
Wang, Y
Zou, B
Liang, W
Alford, NM
McComb, DW
Petrov, PK
Item Type: Journal Article
Abstract: A multilayered film of BaTiO3/SrTiO3 was grown on a LaAlO3 substrate using dual-target pulsed laser deposition technique. High-resolution scanning transmission electron microscopy observations show that the nine unit-cell BaTiO3 layer and the three unit-cell SrTiO3 layer are alternatively arranged in the epitaxial film where a sharp interface exists between the BaTiO3 and SrTiO3 layers. Electron energy-loss spectroscopy analysis demonstrates that the O-K edge spectra of SrTiO3 and BaTiO3 layers are quite distinct; in particular, the energy-loss peak at 547 eV in the SrTiO3 spectrum splits into two peaks in the BaTiO3 spectrum. The multiple-scattering calculations of O-K edge spectra for BaTiO3 and SrTiO3 agree well with the experimental results. The low-energy region (<542 eV) of the O-K edge spectra for both BaTiO3 and SrTiO3 is mainly caused by the hybridization of the O 2p with Ti 3d orbitals. The splitting peaks between 542 and 552 eV in the O-K edge spectra of BaTiO3 are attributed to its complex crystal structure including two unequal oxygen sites and low site symmetry.
Issue Date: 12-Jul-2016
Date of Acceptance: 27-Jun-2016
URI: http://hdl.handle.net/10044/1/39870
DOI: http://dx.doi.org/10.1021/acs.jpcc.6b03833
ISSN: 1932-7455
Publisher: American Chemical Society
Start Page: 16681
End Page: 16686
Journal / Book Title: Journal of Physical Chemistry C
Volume: 120
Issue: 30
Copyright Statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, © 2016 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.jpcc.6b03833.
Keywords: Physical Chemistry
09 Engineering
03 Chemical Sciences
10 Technology
Publication Status: Published
Appears in Collections:Faculty of Engineering
Materials
Faculty of Natural Sciences



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