Structural characterization of Eu2O3-MgO-Na2O-Al2O3-SiO 2 glasses with varying Eu2O3 content

Raman and NMR studies

Zhandos N. Utegulov, Margaret A. Eastman, S. Prabakar, Karl T. Mueller, Abdulatif Y. Hamad, James P. Wicksted, George S. Dixon

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Raman, 27Al and 29Si NMR spectroscopies are used to investigate the structure of [0.15Na2O-0.12MgO-0.03Al2O3-0.70SiO2 ](100-x): [Eu2O3]x glasses with varying Eu2O3 content (x = 0, 0.73, 1.26, 3.90, 5.26 and 8.11 mol%). Spectral changes in the Raman envelope at (900-1240) cm-1 indicate that the number of silica tetrahedra with more than one non-bridging oxygen (NBO) per tetrahedron and the number of silica tetrahedra with one NBO associated with Eu increase with increasing rare-earth concentration. 29Si MAS NMR spectra show a single broad peak with maxima at frequencies attributable to a predominance of Q3 species. Quantitative 27Al and 29Si NMR spectroscopies show that aluminum and silicon species become less observable as Eu2O3 content increases, presumably due to interactions with paramagnetic europium. The 27Al NMR spectra reveal the presence of only tetrahedrally coordinated Al sites, with a gradual increase in the structural disorder associated with these sites as the concentration of Eu2O3 increases. This is in agreement with the appearance of the broad Raman band at 790 cm-1 attributed to Al-O stretching vibrations with Al in fourfold coordination.

Original languageEnglish
Pages (from-to)43-53
Number of pages11
JournalJournal of Non-Crystalline Solids
Volume315
Issue number1-2
DOIs
Publication statusPublished - Jan 2003
Externally publishedYes

Fingerprint

Silicon Dioxide
Nuclear magnetic resonance spectroscopy
Silica
Nuclear magnetic resonance
tetrahedrons
Europium
Oxygen
Glass
nuclear magnetic resonance
glass
Silicon
Aluminum
Rare earths
Stretching
silicon dioxide
oxygen
europium
spectroscopy
envelopes
rare earth elements

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

Structural characterization of Eu2O3-MgO-Na2O-Al2O3-SiO 2 glasses with varying Eu2O3 content : Raman and NMR studies. / Utegulov, Zhandos N.; Eastman, Margaret A.; Prabakar, S.; Mueller, Karl T.; Hamad, Abdulatif Y.; Wicksted, James P.; Dixon, George S.

In: Journal of Non-Crystalline Solids, Vol. 315, No. 1-2, 01.2003, p. 43-53.

Research output: Contribution to journalArticle

Utegulov, Zhandos N. ; Eastman, Margaret A. ; Prabakar, S. ; Mueller, Karl T. ; Hamad, Abdulatif Y. ; Wicksted, James P. ; Dixon, George S. / Structural characterization of Eu2O3-MgO-Na2O-Al2O3-SiO 2 glasses with varying Eu2O3 content : Raman and NMR studies. In: Journal of Non-Crystalline Solids. 2003 ; Vol. 315, No. 1-2. pp. 43-53.
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abstract = "Raman, 27Al and 29Si NMR spectroscopies are used to investigate the structure of [0.15Na2O-0.12MgO-0.03Al2O3-0.70SiO2 ](100-x): [Eu2O3]x glasses with varying Eu2O3 content (x = 0, 0.73, 1.26, 3.90, 5.26 and 8.11 mol{\%}). Spectral changes in the Raman envelope at (900-1240) cm-1 indicate that the number of silica tetrahedra with more than one non-bridging oxygen (NBO) per tetrahedron and the number of silica tetrahedra with one NBO associated with Eu increase with increasing rare-earth concentration. 29Si MAS NMR spectra show a single broad peak with maxima at frequencies attributable to a predominance of Q3 species. Quantitative 27Al and 29Si NMR spectroscopies show that aluminum and silicon species become less observable as Eu2O3 content increases, presumably due to interactions with paramagnetic europium. The 27Al NMR spectra reveal the presence of only tetrahedrally coordinated Al sites, with a gradual increase in the structural disorder associated with these sites as the concentration of Eu2O3 increases. This is in agreement with the appearance of the broad Raman band at 790 cm-1 attributed to Al-O stretching vibrations with Al in fourfold coordination.",
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