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Effect of Zn2+ ions on the structure, morphology and optical properties of CaWO4 microcrystals

Almeida, M. A. P. ; Lima, J. R. O. ; Morila-Santos, C. ; Lisboa Filho, P. N. ; Siu Li, M. ; Longo, E. ; Cavalcante, L. S.

Journal of sol-gel science and technology, 2014-12, Vol.72 (3), p.648-654 [Periódico revisado por pares]

Boston: Springer US

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Título:
Effect of Zn2+ ions on the structure, morphology and optical properties of CaWO4 microcrystals
Autor: Almeida, M. A. P. ; Lima, J. R. O. ; Morila-Santos, C. ; Lisboa Filho, P. N. ; Siu Li, M. ; Longo, E. ; Cavalcante, L. S.
Assuntos: Brief Communication ; Calcium ions ; Calcium tungstates ; Ceramics ; Chemical composition ; Chemistry ; Chemistry and Materials Science ; Colloidal gels. Colloidal sols ; Colloidal state and disperse state ; Composites ; Crystal defects ; Emission analysis ; Energy gap ; Exact sciences and technology ; Field emission microscopy ; Field emission spectroscopy ; General and physical chemistry ; Glass ; Hydrothermal crystal growth ; Inorganic Chemistry ; Lattice parameters ; Materials Science ; Microcrystals ; Morphology ; Nanotechnology ; Natural Materials ; Optical and Electronic Materials ; Optical properties ; Organic chemistry ; Photoluminescence ; Reduction ; Reflectance ; Scanning electron microscopy ; Scheelite ; Spectrum analysis ; Unit cell ; X-ray diffraction
É parte de: Journal of sol-gel science and technology, 2014-12, Vol.72 (3), p.648-654
Descrição: The effect of zinc ions (Zn 2+ ) on the structure, morphology and optical properties of (Ca 1− x Zn x )WO 4 microcrystals with ( x = 0, 0.01, 0.02, and 0.03) obtained by the microwave-hydrothermal method at 170 °C for 1 h is reported in this letter. These microcrystals were characterized by X-ray diffraction (XRD), Rietveld refinement, energy dispersive X-rays spectroscopy (EDXS) and field emission scanning electron microscopy (FE-SEM) images. The optical properties were investigated by ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy and photoluminescence (PL) measurements. XRD patterns and Rietveld refinement data indicated that all the (Ca 1− x Zn x )WO 4 microcrystals present a tetragonal structure and a reduction of lattice parameters and unit cell volume occurs with the increase of Zn 2+ . EDXS data confirms that the elemental chemical composition was achieved for (Ca 1− x Zn x )WO 4 microcrystals. FE-SEM images showed that the replacement of Ca 2+ by the Zn 2+ promotes a reduction of average crystals size and considerable changes in crystal shape starting from dumbbell-like to decorative ball-like (Ca 1− x Zn x )WO 4 microcrystals. UV–Vis spectra evidenced a small increase in optical band gap values (from 5.72 to 5.76 eV). Finally, PL emission of (Ca 1− x Zn x )WO 4 microcrystals was improved until x = 0.02 due to the presence of defects at medium range and new intermediate electronic levels in the band gap associated to the Zn 2+ content. Graphical Abstract
Editor: Boston: Springer US
Idioma: Inglês

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Effect of Zn2+ ions on the structure, morphology and optical properties of CaWO4 microcrystals

Almeida, M. A. P. ; Lima, J. R. O. ; Morila-Santos, C. ; Lisboa Filho, P. N. ; Siu Li, M. ; Longo, E. ; Cavalcante, L. S.

Boston: Springer US

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