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The effect of nitrogen on the structure and thermal properties of beryllium-containing Na-(Li)-Si-O-N glasses

Wójcik, N.A. ; Jonson, B. ; Möncke, D. ; Kamitsos, E.I. ; Segawa, H. ; Karczewski, J. ; Ali, S.

Journal of non-crystalline solids, 2019-10, Vol.522, p.119585, Article 119585 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    The effect of nitrogen on the structure and thermal properties of beryllium-containing Na-(Li)-Si-O-N glasses
  • Autor: Wójcik, N.A. ; Jonson, B. ; Möncke, D. ; Kamitsos, E.I. ; Segawa, H. ; Karczewski, J. ; Ali, S.
  • Assuntos: Beryllium-silicate glasses ; Glass Technology ; Glasteknologi ; Oxynitride glasses ; Oxynitride glasses Beryllium-silicate glasses Raman spectroscopy Thermal properties ; Raman spectroscopy ; Thermal properties
  • É parte de: Journal of non-crystalline solids, 2019-10, Vol.522, p.119585, Article 119585
  • Descrição: Two oxynitride glass series with the composition of 35Na2O-5BeO-(60-x)SiO2-xSi3N4 and 9Li2O- 27Na2O-5BeO-(59-x)SiO2-xSi3N4, were prepared. The glasses' topography and structure were studied by Scanning Electron Microscopy and Raman spectroscopy. The composition was analyzed by Inductively Coupled Plasma Optical Emission Spectrometer, SEM-EDS and nitrogen and oxygen elemental analyzer. Na-(Li)-Be-silicate glasses were found to contain up to approximately 3.4 (or 5.2 for EDS measurements) at.% of N, respectively. The samples were homogenous in their topography and compositions of their cross-sections. The presence of three-fold coordinated nitrogen atoms in Na-Be-Si-O-N glasses results in higher degree of polymerization as was observed by Raman spectroscopy. The spectrum of analogous glasses with lithium did not show a significant decrease in Q2 units but exhibit the presence of Q4 units which also indicates a polymerization of the network. The incorporation of nitrogen in these glasses leads to the increase of the glass transition temperature and thermal stability. •Preparation of oxynitride Na/Li-Be-Si glass system.•Silicate networks made up entirely of Q3 and Q2 silicate units.•Slight decrease in the Q2 fraction is observed with Si3N4 addition.•The evidence for the formation of Q4 units for the glass with >3 at.% of N.•Increase in Tg and glass stability as Si3N4 is substitutes for SiO2.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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