Abstract
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 language | English (US) |
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Pages (from-to) | 140-144 |
Number of pages | 5 |
Journal | Journal of Non-Crystalline Solids |
Volume | 116 |
Issue number | 2-3 |
DOIs | |
State | Published - Feb 2 1990 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry