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Journal of Sol-Gel Science and Technology

, Volume 72, Issue 3, pp 648–654 | Cite as

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

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

Abstract

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.

Graphical Abstract

Keywords

CaWO4 Microcrystals Zinc Distortions Photoluminescence 

Notes

Acknowledgments

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.

Supplementary material

10971_2014_3550_MOESM1_ESM.docx (3.2 mb)
Supplementary material 1 (DOCX 3240 kb)

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • M. A. P. Almeida
    • 1
  • J. R. O. Lima
    • 1
  • C. Morila-Santos
    • 2
  • P. N. Lisboa Filho
    • 3
  • M. Siu Li
    • 4
  • E. Longo
    • 5
  • L. S. Cavalcante
    • 6
  1. 1.Coordenação de Ciências e TecnologiaUniversidade Federal do MaranhãoSão LuísBrazil
  2. 2.Departamento de FísicaUniversidade Federal do CearáFortalezaBrazil
  3. 3.MAv–DF UNESP-Universidade Estadual PaulistaBauruBrazil
  4. 4.Instituto de Física de São CarlosUniversidade de São PauloSão CarlosBrazil
  5. 5.Instituto de QuímicaUNESP (Universidade Estadual Paulista)AraraquaraBrazil
  6. 6.CCN-DQ-GERATECUniversidade Estadual do PiauíTeresinaBrazil

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