The connectivity of silicon sites in silicate glasses, as determined by two-dimensional 29Si nuclear magnetic resonance spectroscopy

Christopher T.G. Knight, R. J. Kirkpatrick, Eric Oldfield

Research output: Contribution to journalArticlepeer-review


The application of two-dimensional silicon-29 homonuclear shift correlated magic angle spinning nuclear magnetic resonance (COSY MAS NMR) spectroscopy to silicate glasses prepared using silica isotopically enriched in silicon-29 is reported. Two sodium silicate glass compositions and a sodium phospho-silicate glass were examined. The results suggest that a substantial proportion of the four coordinate silicate sites in sodium silicate glasses Q2/Q3 and Q3/Q4 are interconnected on a nearest neighbor level. Experiments with the sodium silicate glasses prepared with varying levels of isotopic enrichment reveal a correlation between the intensity of the cross peak and the percentage of silicon-29 in the sample, confirming this observation. No cross peaks were observed for the sodium phospho-silicate glass, implying that the Q4 and six coordinate silicate sites present are not linked together at the nearest neighbor level.

Original languageEnglish (US)
Pages (from-to)140-144
Number of pages5
JournalJournal of Non-Crystalline Solids
Issue number2-3
StatePublished - Feb 2 1990

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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