Structural and morphological characterization of Pb1-xBaxTiO3 thin films prepared by chemical route: An investigation of phase transition
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Data
2008-04-15
Autores
Pontes, Fenelon Martinho Lima [UNESP]
Galhiane, Mario Sergio [UNESP]
Santos, L. S. [UNESP]
Rissato, R. S. [UNESP]
Pontes, D. S. L. [UNESP]
Longo, Elson [UNESP]
Leite, E. R.
Pizani, P. S.
Chiquito, A. J.
Machado, M. A. C.
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Elsevier B.V. Sa
Resumo
Detailed room temperature micro-Raman scattering, X-ray diffraction, atomic force microscopy and specular reflectance infrared Fourier transform spectroscopy studies were carried out on soft chemical by processed Pb1-xBaxTiO3 thin films. The micro-Raman spectra pointed the existence of a stable tetragonal ferroelectric phase in the entire composition range (0 < x <= 1). The infrared reflectance spectra showed that the frequency of several peaks decreases as the Ba2+ concentration increases. These features are correlated to a decrease in the tetragonal distortion of the TiO6 octahedra as the Ba2+ concentration increases. Furthermore, as x increases from 0.70 to 1.0, the Raman spectrum shows an evolution towards the well-known Raman spectrum of the tetragonal BaTiO3. Therefore, we demonstrated that the combination of solid solution PbTiO3-BaTiO3 with a grain size in the order of 30-40 nm supports the tetragonal ferroelectric phase at room temperature. (C) 2007 Elsevier B.V. All rights reserved.
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thin films, chemical synthesis, microstructure, phase transitions
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Materials Chemistry and Physics. Lausanne: Elsevier B.V. Sa, v. 108, n. 2-3, p. 312-318, 2008.