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Does six-coordinate germanium exist in Na2O-GeO2 glasses? Oxygen-17 nuclear magnetic resonance measurements
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UNSPECIFIED (1998) Does six-coordinate germanium exist in Na2O-GeO2 glasses? Oxygen-17 nuclear magnetic resonance measurements. In: 7th International Conference on the Structure of Non-Crystalline Materials (NCM7), SEP 15-19, 1997, CAGLIARI, ITALY.
Full text not available from this repository.Abstract
Sodium germanate glasses of compositions Na2O . 9GeO(2) and 2Na(2)O . 9GeO(2) have been studied using solid-state O-17 nuclear magnetic resonance (NMR). Quartz-type and rutile-type GeO2 were used as examples of oxygen connected to 4-fold and 6-fold coordinated germanium. The O-17 spectra yielded nuclear quadrupole coupling constants, (e(2)qQ/h), asymmetry parameters, (eta) and isotropic chemical shifts, (delta(i)): from line shape simulations. The chemical shifts of oxygen in [GeO4] and [GeO6] units in germania are 70 +/- 5 and 160 +/- 5 ppm, respectively, with only a small difference in the quadrupole coupling constant but a larger difference in the asymmetry parameter. In the Na2O-GeO2 glasses, the quadrupole coupling constant decreases with addition of Na2O to the glass with no evidence for any oxygen with a smaller electric field gradient, indicating that there are very few non-bridging oxygens (NBOs) present-The O-17 chemical shift in Na2O . 9GeO(2) is similar to that in [GeO6] while in 2Na(2)O . 9GeO(2) the chemical shift is close to that of [GeO4]. (C) 1998 Elsevier Science B.V. All rights reserved.
| Item Type: | Conference Item (UNSPECIFIED) |
|---|---|
| Subjects: | T Technology > TP Chemical technology T Technology > TA Engineering (General). Civil engineering (General) |
| Journal or Publication Title: | JOURNAL OF NON-CRYSTALLINE SOLIDS |
| Publisher: | ELSEVIER SCIENCE BV |
| ISSN: | 0022-3093 |
| Date: | July 1998 |
| Volume: | 232 |
| Number of Pages: | 6 |
| Page Range: | pp. 440-445 |
| Publication Status: | Published |
| Title of Event: | 7th International Conference on the Structure of Non-Crystalline Materials (NCM7) |
| Location of Event: | CAGLIARI, ITALY |
| Date(s) of Event: | SEP 15-19, 1997 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/15440 |
Data sourced from Thomson Reuters' Web of Knowledge
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