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

Journal of Sol-Gel Science and Technology Volume: 72 Issue: 3 Pages: 648-654 Published: 2014

Proposed growth and formation mechanisms for the (Ca1-xZnx)WO4 microcrystals with Zn2+ concentrations: a electrostatic attraction of Ca2+/Zn2+ and WO2- 4 ions in solution and possible interactions, b aggregation process for small nuclei, c small crystals grow by self-assemble process due to specific conditions of the chemical reaction and d final stage of crystals growth of dumbbell-, cocoa-, custard apple-, decorative ball-like microcrystals.

SEE PDF Full Length Article

Writers: Márcio A. P. Almeida, J. R. O. Lima, C. Morila-Santos, Paulo N. Lisboa Filho, M. Siu Li, Elson Longo, Laécio S. Cavalcante

Keywords: CaWO4; Microcrystal; Zinc; Distortions; Photoluminescence  

Abstract: The effect of zinc ions (Zn2+) on the structure, morphology and optical properties of (Ca1-xZnx)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.

Rose Portasio
Sobre Rose Portasio 131 Artigos
Assessora Administrativa no LIEC - IQ/Unesp