Effect of Zn2+ ions on the structure, morphology and optical properties of CaWO4 microcrystals
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The effect of zinc ions (Zn2+) on the structure, morphology and optical properties of (Ca1−x Zn x )WO4 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 (Ca1−x Zn x )WO4 microcrystals present a tetragonal structure and a reduction of lattice parameters and unit cell volume occurs with the increase of Zn2+. EDXS data confirms that the elemental chemical composition was achieved for (Ca1−x Zn x )WO4 microcrystals. FE-SEM images showed that the replacement of Ca2+ by the Zn2+ promotes a reduction of average crystals size and considerable changes in crystal shape starting from dumbbell-like to decorative ball-like (Ca1−x Zn x )WO4 microcrystals. UV–Vis spectra evidenced a small increase in optical band gap values (from 5.72 to 5.76 eV). Finally, PL emission of (Ca1−x Zn x )WO4 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 Zn2+ content.
KeywordsCaWO4 Microcrystals Zinc Distortions Photoluminescence
The Brazilian authors acknowledge the financial support of the Brazilian research financing institutions: CNPq (479644/2012-8; 304531/2013-8), FAPESP (12/18597-0; 09/50303-4; 2013/07296-2), and CAPES.
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