Structural refinement and photoluminescence properties of cube-like (Ca 1-xCu x)TiO 3 crystals synthesized by the microwave-hydrothermal method
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Data
2012-08-20
Autores
Oliveira, Larissa H.
De Moura, Ana P. [UNESP]
Cavalcante, Laécio S. [UNESP]
Antonio, Selma G. [UNESP]
Longo, Elson [UNESP]
Varela, José Arana [UNESP]
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Resumo
In this work, (Ca 1-xCu x)TiO 3 crystals with (x = 0, 0.01 and 0.02), labeled as CTO, CCTO1 and CCTO2, were synthesized by the microwave-hydrothermal method at 140°C for 32 min. XRD patterns (Fig. 1), Rietveld refinement and FT-Raman spectroscopy indicated that these crystals present orthorhombic structure Pbnm. Micro-Raman and XANES spectra suggested that the substitution of Ca by Cu in A-site promoted a displacement of the [TiO6]-[TiO6] clusters adjacent from its symmetric center, which leads distortions on the [CaO 12] clusters neighboring and consequently cause the strains into the CaTiO3 lattice. FE-SEM images showed that these crystals have an irregular shape as cube like probably indicating an Ostwald-ripening and self-assemble as dominant mechanisms to crystals growth. The powders presented an intense PL blue-emission.
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Chemical synthesis, Luminescence, Microcrystals, Optical materials, XANES, Blue-emission, Dominant mechanism, FT- Raman spectroscopy, Irregular shape, Micro-Raman, Microwave-hydrothermal methods, Orthorhombic structures, Photoluminescence properties, Self-assemble, Structural refinement, TiO, XANES spectra, XRD patterns, Calcium, Crystal growth, Crystal structure, Exhibitions, Films, Nanotechnology, Ostwald ripening, Perovskite, Raman spectroscopy, Rietveld refinement, Nanocomposite films
Como citar
Technical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012, p. 394-397.