11B NMR spectra and structure of boric oxide and alkali borate glasses

Prabakar, S and Rao, KJ and Rao, CNR (1990) 11B NMR spectra and structure of boric oxide and alkali borate glasses. In: Proceedings of the Royal Society of London, Series A, 429 (1876). pp. 1-15.

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Abstract

High-resoln. 11B magic-angle-spinning (MAS) NMR investigations of boric oxide and alkali borate glasses have been carried out. The chem. shift of the trigonal boron shows anomalous behavior .apprx.10 mol.% alkali oxide. In an attempt to explain this unusual feature, the structural model for B3O3 glass was examd. The study suggests that at .apprx.66% of the B atoms is likely to be present in the boroxol units, the rest being present in loose BO3/2 units. This model is not only consistent with the earlier literature, but also shows that stringent topochem. factors are involved in the formation of the tetraborate and the diborate units in alkali borate glasses. It seems plausible that the remarkable tendency of B2O3 to vitrifying may itself have a structural origin.

Item Type:	Journal Article
Publication:	Proceedings of the Royal Society of London, Series A
Publisher:	The Royal Society
Additional Information:	Copyright of this article belongs to The Royal Society.
Keywords:	Boric oxide
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	18 Dec 2007
Last Modified:	19 Sep 2010 04:41
URI:	http://eprints.iisc.ac.in/id/eprint/12544

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