Lattice Structure and Dynamics of Two-Layer Heterostructures of Barium–Strontium Titanate and Layered Bismuth Titanate of Various Thicknesses on a Magnesium Oxide Substrate
| Autor: | V. M. Mukhortov, A. S. Anokhin, D. V. Stryukov, Yu. I. Golovko |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Bismuth titanate Analytical chemistry Heterojunction Substrate (electronics) Crystal structure Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound symbols.namesake chemistry Sputtering visual_art 0103 physical sciences visual_art.visual_art_medium symbols Ceramic 010306 general physics Raman spectroscopy Monoclinic crystal system |
| Zdroj: | Physics of the Solid State. 61:2155-2159 |
| ISSN: | 1090-6460 1063-7834 |
| DOI: | 10.1134/s1063783419110039 |
| Popis: | The lattice structure and dynamics of single-crystal Bi4Ti3O12 with a thickness from 4 to 430 nm on a (001)MgO substrate with a previously deposited Ba0.4Sr0.6TiO3 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 Bi4Ti3O12 unit cell is perpendicular to the substrate, and direction [100] has an angle of ±45° to the [100]MgO direction. At the thicknesses of Bi4Ti3O12 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 Bi4Ti3O12 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. |
| Databáze: | OpenAIRE |
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