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A parameterisation for the composition dependence of N-4 in borate glasses
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Hannon, Alex C. and Holland, Diane (2006) A parameterisation for the composition dependence of N-4 in borate glasses. In: 5th International Conference on Borate Glasses, Crystals and Melts, Trento, Italy, Jul 10-14, 2005. Published in: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Vol.47 (No.4). pp. 449-454.
Full text not available from this repository.Abstract
N-4 is defined to be the fraction of borons in a borate which are four-coordinated, and this can be determined reliably by NMR measurements. Although the composition dependence of N-4 has been measured for numerous glass forming systems, little work has been done to understand its behaviour. We have used the most extensive set of N-4 data in the literature [Jellison Jr., G. E., Feller, S. A. & Bray, P. J. Phys. Chem. Glasses, 1978, 19, 52], for lithium borate glasses, to develop a parameterisation for the composition dependence of N-4. This involves a conversion factor, a, which has the maximum value of two for low modifier content, but decays exponentially above a limiting composition, which occurs when there is a network of alternating BO3 and BO4 units. Above this composition the creation of BO4 units is not favoured because this brings centres of negative charge into close proximity. Our parameterisation is empirical, but has potential for use in the characterisation and comparison of N-4 data from a wide variety of borate glass systems.
| Item Type: | Conference Item (Paper) |
|---|---|
| Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
| Divisions: | Faculty of Science > Physics |
| Journal or Publication Title: | Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B |
| Publisher: | Society of Glass Technology |
| ISSN: | 1753-3562 |
| Date: | August 2006 |
| Volume: | Vol.47 |
| Number: | No.4 |
| Number of Pages: | 6 |
| Page Range: | pp. 449-454 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Conference Paper Type: | Paper |
| Title of Event: | 5th International Conference on Borate Glasses, Crystals and Melts |
| Type of Event: | Conference |
| Location of Event: | Trento, Italy |
| Date(s) of Event: | Jul 10-14, 2005 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/32441 |
Data sourced from Thomson Reuters' Web of Knowledge
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