Shift of Phase Transition Temperature in Strontium Titanate Thin Films

The results of structural and electrical characterizations of SrTiO 3 thin films deposited onto MgO and LaAlO 3 substrates by pulsed laser deposition technique are presented. The influence of substrate and annealing procedure on the crystalline structure and dielectric properties of these ferroelect...

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Bibliographic Details
Published in:Integrated ferroelectrics 2003-08, Vol.58 (1), p.1371-1379
Main Authors: Astafiev, Konstantin, Sherman, Vladimir, Tagantsev, Alexander, Setter, Nava, Petrov, Peter, Kaydanova, Tatyana, Ginley, David, Hoffmann-Eifert, Susanne, Böttger, Ulrich, Waser, Rainer
Format: Article
Language:English
Subjects:
dielectric properties
Ferroelectric thin films
misfit strains
non-stoichiometry
phase transition
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Summary:The results of structural and electrical characterizations of SrTiO 3 thin films deposited onto MgO and LaAlO 3 substrates by pulsed laser deposition technique are presented. The influence of substrate and annealing procedure on the crystalline structure and dielectric properties of these ferroelectric thin films are investigated. The obtained experimental data are analyzed in terms of the Landau theory taking into account the room-temperature lattice mismatch of the ferroelectric and substrates as well as the difference in their thermal expansion. It is shown that the behavior of the SrTiO 3 thin films could not be attributed to the effect of the film/substrate mechanical coupling. As a possible nature of the observed behavior one can consider the non-stoichiometry of the film composition caused by the chemical contact of the film with the substrate and by the annealing.
ISSN:1058-4587
1607-8489
DOI:10.1080/10584580390261134