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Rietveld refinement, morphology and optical properties of (Ba 1-xSrx)MoO4 crystals
  • Universidade Federal de São Carlos (UFSCar)
  • Universidade Estadual Paulista (UNESP)
  • CCN
  • Instituto Federal Do Maranhão, Química
  • 0021-8898
  • 1600-5767
In this article, the structural refinement, morphology and optical properties of barium strontium molybdate [(Ba1-x Sr x )MoO4 with x = 0, 0.25, 0.50, 0.75 and 1] crystals, synthesized by the co-precipitation (drop-by-drop) method, are reported. The crystals obtained were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, and Fourier transform-Raman (FT-Raman) and Fourier transform-infrared (FT-IR) spectroscopies. The shapes of the crystals were observed by means of field-emission scanning electron microscopy (FE-SEM). The optical properties were investigated using ultraviolet-visible (UV-Vis) absorption spectroscopy and photoluminescence (PL) measurements. XRD patterns, Rietveld refinement, and FT-Raman and FT-IR spectra showed that all of the crystals are monophasic with a scheelite-type tetragonal structure. The refined lattice parameters and atomic positions were employed to model the [BaO8], [SrO8] and [MoO4] clusters in the tetragonal lattices. The FE-SEM images indicate that increased x content produces a decrease in the crystal size and modifications in the crystal shape. UV-Vis spectra indicated a decrease in the optical band gap with an increase in x in the (Ba1-x Sr x )MoO4 crystals. Finally, a decrease in the intensity of PL emission is apparent with an increase in x up to 0.75 in the (Ba1-x Sr x )MoO4 crystal lattice when excited by a wavelength of 350nm, probably associated with the degree of structural order-disorder. © 2013 International Union of Crystallography Printed in Singapore - all rights reserved.
Issue Date: 
Journal of Applied Crystallography, v. 46, n. 5, p. 1434-1446, 2013.
Time Duration: 
  • Ba arrange=1-x Sr x)MoO4
  • clusters
  • co-precipitation
  • photoluminescence
  • Rietveld refinement
  • Field emission scanning electron microscopy
  • Fourier transform infra reds
  • Photoluminescence measurements
  • Strontium molybdate
  • Structural refinement
  • Tetragonal lattices
  • Tetragonal structure
  • Coprecipitation
  • Crystal structure
  • Drops
  • Enamels
  • Morphology
  • Optical properties
  • Photoluminescence
  • Strontium compounds
  • Tungstate minerals
  • X ray diffraction
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Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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