Lattice Structure and Dynamics of Two-Layer Heterostructures of Barium–Strontium Titanate and Layered Bismuth Titanate of Various Thicknesses on a Magnesium Oxide Substrate
- Federal Research Center, Southern Scientific Center, Russian Academy of Sciences (Russian Federation)
The lattice structure and dynamics of single-crystal Bi{sub 4}Ti{sub 3}O{sub 12} with a thickness from 4 to 430 nm on a (001)MgO substrate with a previously deposited Ba{sub 0.4}Sr{sub 0.6}TiO{sub 3} sublayer (4 nm) have been studied. The two-layer structures were prepared by radio-frequency sputtering of ceramic targets of the corresponding compositions. The X-ray diffraction studies performed at room temperature have shown that, in this heterostructure, axis c of the Bi{sub 4}Ti{sub 3}O{sub 12} unit cell is perpendicular to the substrate, and direction [100] has an angle of ±45° to the [100]MgO direction. At the thicknesses of Bi{sub 4}Ti{sub 3}O{sub 12} to ~40 nm, the film unit cell is compressed in the direction of a normal to the substrate plane and extended in the conjugate plane, and the sign of the deformation is changed at large thicknesses. It is found that the phonon mode frequency in the Bi{sub 4}Ti{sub 3}O{sub 12} film shift and additional peaks appear in the Raman spectra, which demonstrates an increase in the degree of monoclinic distortion of the film crystal structure as compared to the crystal structure.
- OSTI ID:
- 22925023
- Journal Information:
- Physics of the Solid State, Journal Name: Physics of the Solid State Journal Issue: 11 Vol. 61; ISSN 1063-7834
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CERAMICS
DEPOSITION
LATTICE PARAMETERS
LAYERS
MAGNESIUM OXIDES
MONOCLINIC LATTICES
MONOCRYSTALS
PHONONS
RADIOWAVE RADIATION
RAMAN SPECTRA
SPUTTERING
STRONTIUM TITANATES
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
X-RAY DIFFRACTION