Internal stress and the deformation phase transition in nanoscale barium-strontium titanate films

It has been established by varying the thickness of Ba 0.8 Sr 0.2 TiO 3 heteroepitaxial films grown via the layer-by-layer mechanism on (100) MgO substrates that there is a critical film thickness (∼50 nm): the internal strain field in the films with a thickness below critical is much weaker than in...

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Bibliographic Details
Published in:Crystallography reports 2008-05, Vol.53 (3), p.502-507
Main Authors: Mukhortov, V. M., Golovko, Yu. I., Yuzyuk, Yu. I., Latush, L. T., Zhigalina, O. M., Kuskova, A. N.
Format: Article
Language:English
Subjects:
BARIUM COMPOUNDS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Crystallography and Scattering Methods
DEFORMATION
LAYERS
MAGNESIUM OXIDES
NANOSTRUCTURES
PHASE TRANSFORMATIONS
Physics
Physics and Astronomy
RAMAN SPECTROSCOPY
RESIDUAL STRESSES
STRAINS
STRONTIUM COMPOUNDS
Surface and Thin Films
THICKNESS
THIN FILMS
TITANATES
X-RAY DIFFRACTION
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Summary:It has been established by varying the thickness of Ba 0.8 Sr 0.2 TiO 3 heteroepitaxial films grown via the layer-by-layer mechanism on (100) MgO substrates that there is a critical film thickness (∼50 nm): the internal strain field in the films with a thickness below critical is much weaker than in the films with a thickness exceeding critical. Tensile and compressive stresses occur at thicknesses, respectively, below and above critical. The existence of critical thickness is confirmed by the X-ray diffraction data and Raman spectroscopy.
ISSN:1063-7745
1562-689X
DOI:10.1134/S1063774508030206