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Structural investigations of tungsten silver phosphate glasses by solid state NMR, vibrational and X-ray absorption near edge spectroscopies

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Title: Structural investigations of tungsten silver phosphate glasses by solid state NMR, vibrational and X-ray absorption near edge spectroscopies
Authors: Santagneli, Silvia H.1, Poirier, Gaël2, Rinke, Matthias T.3, Ribeiro, Sidney J.L.1, Messaddeq, Younes1,4 younes.messaddeq@copl.ulaval.ca, Eckert, Hellmut3 eckerth@uni-munster.de
Source: Journal of Non-Crystalline Solids. May2011, Vol. 357 Issue 10, p2126-2131. 6p.
Subjects: Structural analysis (Science), Tungsten, Silver phosphates, Glass, Solid state chemistry, X-ray absorption near edge structure
Abstract: Abstract: Glasses were prepared in the pseudo-binary system (1−x)AgPO3–xWO3 (0≤×≤0.6mol%). The structural evolution of the vitreous network was studied as a function of composition by thermal analysis, Fourier Transform Infrared spectroscopy (FTIR), Raman scattering, high resolution 31P solid state NMR and XANES at the W-L1 absorption edge. For compositions with x ranging from 0 to 0.5 a pronounced increase in the glass transition temperature is observed, suggesting a significant increase in the glass network connectivity. At the same time Raman spectra indicate that tungsten atoms are linked to non-bridging oxygen atoms (W–O- or W=O bonded species) whereas the 31P MAS-NMR spectra indicate the successive formation of new P–O–W linkages. The formation of some anionic tungsten sites (if these are revealed by the presence of W–O terminal bonds) implies an increase in the average degree of polymerization of the phosphate network, which is consistent with the compositional evolution of the 31P MAS-NMR spectra at low x values. For higher x-values, the Raman spectra indicate the presence of W–O–W linkages. W-L1 XANES data indicate that at least 90% of tungsten atoms are octahedrally coordinated. [Copyright &y& Elsevier]
Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 60240985
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  Data: Structural investigations of tungsten silver phosphate glasses by solid state NMR, vibrational and X-ray absorption near edge spectroscopies
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  Data: <searchLink fieldCode="AR" term="%22Santagneli%2C+Silvia+H%2E%22">Santagneli, Silvia H.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Poirier%2C+Gaël%22">Poirier, Gaël</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Rinke%2C+Matthias+T%2E%22">Rinke, Matthias T.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Ribeiro%2C+Sidney+J%2EL%2E%22">Ribeiro, Sidney J.L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Messaddeq%2C+Younes%22">Messaddeq, Younes</searchLink><relatesTo>1,4</relatesTo><i> younes.messaddeq@copl.ulaval.ca</i><br /><searchLink fieldCode="AR" term="%22Eckert%2C+Hellmut%22">Eckert, Hellmut</searchLink><relatesTo>3</relatesTo><i> eckerth@uni-munster.de</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Non-Crystalline+Solids%22">Journal of Non-Crystalline Solids</searchLink>. May2011, Vol. 357 Issue 10, p2126-2131. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Structural+analysis+%28Science%29%22">Structural analysis (Science)</searchLink><br /><searchLink fieldCode="DE" term="%22Tungsten%22">Tungsten</searchLink><br /><searchLink fieldCode="DE" term="%22Silver+phosphates%22">Silver phosphates</searchLink><br /><searchLink fieldCode="DE" term="%22Glass%22">Glass</searchLink><br /><searchLink fieldCode="DE" term="%22Solid+state+chemistry%22">Solid state chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+absorption+near+edge+structure%22">X-ray absorption near edge structure</searchLink>
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  Data: Abstract: Glasses were prepared in the pseudo-binary system (1−x)AgPO3–xWO3 (0≤×≤0.6mol%). The structural evolution of the vitreous network was studied as a function of composition by thermal analysis, Fourier Transform Infrared spectroscopy (FTIR), Raman scattering, high resolution 31P solid state NMR and XANES at the W-L1 absorption edge. For compositions with x ranging from 0 to 0.5 a pronounced increase in the glass transition temperature is observed, suggesting a significant increase in the glass network connectivity. At the same time Raman spectra indicate that tungsten atoms are linked to non-bridging oxygen atoms (W–O- or W=O bonded species) whereas the 31P MAS-NMR spectra indicate the successive formation of new P–O–W linkages. The formation of some anionic tungsten sites (if these are revealed by the presence of W–O terminal bonds) implies an increase in the average degree of polymerization of the phosphate network, which is consistent with the compositional evolution of the 31P MAS-NMR spectra at low x values. For higher x-values, the Raman spectra indicate the presence of W–O–W linkages. W-L1 XANES data indicate that at least 90% of tungsten atoms are octahedrally coordinated. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1016/j.jnoncrysol.2011.01.021
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      – Code: eng
        Text: English
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        PageCount: 6
        StartPage: 2126
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        Type: general
      – SubjectFull: Tungsten
        Type: general
      – SubjectFull: Silver phosphates
        Type: general
      – SubjectFull: Glass
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      – SubjectFull: Solid state chemistry
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      – SubjectFull: X-ray absorption near edge structure
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      – TitleFull: Structural investigations of tungsten silver phosphate glasses by solid state NMR, vibrational and X-ray absorption near edge spectroscopies
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              Text: May2011
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