TY - JOUR
T1 - The connectivity of silicon sites in silicate glasses, as determined by two-dimensional 29Si nuclear magnetic resonance spectroscopy
AU - Knight, Christopher T.G.
AU - Kirkpatrick, R. J.
AU - Oldfield, Eric
N1 - Funding Information:
* This work was supported by the Solid State Chemistry Program of the US National Science Program (grant DMR 86-15206) and by the Earth Sciences Program (grant NSF EAR 87-06929).
PY - 1990/2/2
Y1 - 1990/2/2
N2 - 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.
AB - 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.
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U2 - 10.1016/0022-3093(90)90685-F
DO - 10.1016/0022-3093(90)90685-F
M3 - Article
AN - SCOPUS:0025384462
SN - 0022-3093
VL - 116
SP - 140
EP - 144
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - 2-3
ER -