Structural study of thin films prepared from tungstate glass matrix by Raman and X-ray absorption spectroscopy

Montanari, Bianca; Barbosa, A. J.; Ribeiro, Sidney José Lima; Messaddeq, Younès; Poirier, Gaël; Li, Máximo S.

doi:10.1016/j.apsusc.2008.02.107

Cited by 9 publications

(3 citation statements)

References 40 publications

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“…Moreover, the intensity of the W-L 1 pre-edge absorption peak (X) is very sensitive and dependent on the degree of distortion in octahedral [WO 6 ] clusters relate to 5d(W) ? 2p(O) orbitals [52]. We calculate the area of the W-L 1 pre-edge peak to evaluate the effect of strontium precursors in the degree of distortion of [WO 4 ] clusters (order-disorder at short range) found in SrWO 4 microcrystals ( Fig.…”

Section: Xanes Spectroscopy Analysesmentioning

confidence: 99%

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

et al. 2015

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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 (SrWO 4) 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 [WO 4 ] clusters inside the SrWO 4 structure. Field emission scanning electron microscopy (FE-SEM) images showed the presence of pitch and longleaf pine cone-like SrWO 4 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 [WO 4 ] clusters.

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Section: Xanes Spectroscopy Analysesmentioning

confidence: 99%

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

et al. 2015

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“…W 5+ ions are well known paramagnetic ions. The presence of tungsten in antimony arsenate glasses, further, makes the glasses suitable for optoelectronic devices since they exhibit photochromism and electrochromism properties [6,7]. The structural groups of tungsten oxide are expected to alternate with AsO 3 , AsO 4 and SbO 3 structural groups and are likely to influence the physical properties of antimony arsenate glasses to a large extent (since some of the vibrational modes of these groups lie in the region of SbO 3 and AsO 3 structural groups).…”

Section: Introductionmentioning

confidence: 98%

Structural impact of tungsten ions on ZnO–Sb2O3–As2O3 glass system

Krishna

Rao

2011

Journal of Alloys and Compounds

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“…Moreover, it is expected that these tungsten oxide clusters should act as nucleating agents in the glass network and promote glass crystallization. Crystallization of WO 3 in amorphous materials was extensively investigated in WO 3 -based amorphous thin films [28][29][30][31][32][33] but controlled precipitation of WO 3 in glasses was never reported. Only a few works report crystallization studies in tellurite or phosphate glasses containing WO 3 [34][35][36] or preparation of nanocrystals containing tungsten in phosphate glasses [37].…”

Section: Introductionmentioning

confidence: 99%