Title
Structure and microstructure of epitaxial <tex>$Sr_{n}Fe_{n}O_{3n-1}$</tex> filmsStructure and microstructure of epitaxial <tex>$Sr_{n}Fe_{n}O_{3n-1}$</tex> films
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Electron microscopy for materials research (EMAT)
Publication type
article
Publication
Subject
Physics
Engineering sciences. Technology
Source (journal)
Philosophical magazine
Philosophical magazine. - London, 1945 - 1977
Volume/pages
84(2004):36, p. 3825-3841
ISSN
1478-6435
ISI
000225854700001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Thin films of SrFeO3-x (0 less than or equal to x less than or equal to 0.5) (SFO) grown on a (LaAlO3)(0.3) (SrAl0.5Ta0.5O3)(0.7) (LSAT) substrate by Pulsed laser deposition have been structurally investigated by electron diffraction and high resolution transmission electron microscopy for different post-deposition oxygen treatments. During the deposition and post-growth oxidation, the oxygen-reduced SFO films accept extra oxygen along the tetrahedral layers to minimize the elastic strain energy. The oxidation process stops at a concentration SFO2.875 and/or SFO2.75 because a zero misfit with the LSAT substrate is reached. A possible growth mechanism and phase transition mechanism are suggested. The non-oxidized films exhibit twin boundaries having a local perovskite-type structure with a nominal composition close to SFO3.
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