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

Prabakar, S. ; Rao, K. J. ; Rao, C. N. R. (1990) 11B NMR spectra and structure of boric oxide and alkali borate glasses Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences, 429 (1876). pp. 1-15. ISSN 1364-5021

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Official URL: http://rspa.royalsocietypublishing.org/content/429...

Related URL: http://dx.doi.org/10.1098/rspa.1990.0048


High-resolution 11B magic-angle-spinning (MAS) NMR investigations of boric oxide and alkali borate glasses have been carried out. The chemical shift of the trigonal boron shows anomalous behavior around 10 mol.% alkali oxide. In an attempt to explain this unusual feature, the structural model for B3O3 glass was examd. The study suggests that around 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 topochemical 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.

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