Author： Prabakar S. Mueller K. T. Pantano C. G.
Publisher： Society of Glass Technology
ISSN： 0031-9090
Source： Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Vol.44, Iss.2, 2003-04, pp. : 125-131
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Abstract
A series of barium aluminoborate glasses have been investigated by single and double resonance magic angle spinning (MAS) nuclear magnetic resonance (NMR) techniques. 11B MAS NMR spectra indicate that boron is present in three and four coordinate environments,while 27Al MAS NMR spectra show that aluminium is present in four, five and six coordinate environments (four coordinated aluminium being the predominant aluminium species). Glasses with high BaO content exhibit resonances from two types of trigonal boron species in units containing either two or three bridging oxygens. Structural correlations between 27Al and 11B nuclei have been probed using 11B{Al} and 27Al{11B} transfer of populations in double resonance (TRAPDOR) NMR spectroscopy. Results obtained from TRAPDOR NMR reveal short range couplings between tetrahedral boron and aluminium sites and the tetrahedral to trigonal boron ratio obtained from 11B{27Al} TRAPDOR is higher than that found from quantitative one dimensional 11B NMR.
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