Morphological and Structural changes of CaxSr1-xTiO3 Powders Obtained by the Microwave-Assisted Hydrothermal Method
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Data
2012-01-01
Autores
Souza, Agda E. [UNESP]
Santos, Gleyson T. Almeida [UNESP]
Silva, Ranilson A. [UNESP]
Moreira, Mario L.
Volanti, Diogo P. [UNESP]
Paris, Elaine C.
Teixeira, Silvio R. [UNESP]
Longo, Elson [UNESP]
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Wiley-Blackwell
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CaxSr1-xTiO3 samples were synthesized by the microwave-assisted hydrothermal method. The X-ray diffraction results indicate that strontium calcium titanates powders show two crystalline structures: perovskite cubic and orthorhombic. The ultraviolet-visible spectra show that the band gap energies decrease with the Ca addition, suggesting imperfections or defects in the forbidden band of the titanates. The photoluminescence spectra show a broad band, which is usually observed at low temperatures in perovskite-type crystals. The nanoparticles show a nonuniform distribution with polyhedral morphology and spherical agglomerates, which change to faceted surfaces suggesting that the sample can reach other morphologies which ensure symmetry of lowest energy.
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International Journal of Applied Ceramic Technology. Hoboken: Wiley-blackwell, v. 9, n. 1, p. 186-192, 2012.