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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of different strontium precursors on the growth process and optical properties of SrWO4 microcrystals

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Sczancoski, J. C. [1] ; Avansi, W. [2] ; Costa, M. G. S. [3] ; Li, M. Siu [4] ; Mastelaro, V. R. [4] ; Santos, R. S. [5] ; Longo, E. [1] ; Cavalcante, L. S. [5]
Total Authors: 8
[1] CDMF Univ Estadual Paulista, BR-14801907 Araraquara, SP - Brazil
[2] DF UFSCar Univ Fed Sao Carlos, BR-13565905 Sao Carlos, SP - Brazil
[3] Inst Fed Maranhao, Quim, BR-65025001 Sao Luis, MA - Brazil
[4] Inst Fis Sao Carlos, BR-13560250 Sao Carlos, SP - Brazil
[5] Univ Estadual Piaui, PPGQ GERATEC, BR-64002150 Teresina, PI - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Journal of Materials Science; v. 50, n. 24, p. 8089-8103, DEC 2015.
Web of Science Citations: 9

In this paper, an experimental study was performed on the effect induced by different strontium precursors in the growth processes and optical properties of strontium tungstate (SrWO4) microcrystals synthesized by the co-precipitation method. The structural behavior was analyzed by means of X-ray diffractions, Rietveld refinements, Fourier transform (FT)-Raman, and FT-infrared spectroscopies. X-ray absorption near-edge structure spectra performed at the W-L-1 and L-3 edges revealed the first coordination shell around the tungsten atoms is composed of four oxygens, i.e., existence of tetrahedral {[}WO4] clusters inside the SrWO4 structure. Field emission scanning electron microscopy (FE-SEM) images showed the presence of pitch and longleaf pine cone-like SrWO4 microcrystals for most of the strontium precursors employed in the synthesis. Based on these FE-SEM images, a hypothetical crystal growth mechanism was proposed to explain the origin of these microcrystals. The optical properties were investigated by ultraviolet-visible spectroscopy and photoluminescence (PL) measurements at room temperature. The different optical band gap values found for this material, depending on the type of strontium precursor, were correlated with the existence of intermediary energy levels within the forbidden region. Finally, PL profiles were associated to the degree of distortions in tetrahedral {[}WO4] clusters. (AU)

FAPESP's process: 12/14004-5 - Investigation of the photoluminescence and photocatalytic properties of pure and Mn, Cu, and Zn-doped BaWO4 and BaMoO4 powders
Grantee:Júlio César Sczancoski
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC