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Clustering in borate-rich alkali borophosphate glasses: a 11B and 31P MAS NMR study

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11B and 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy are used to quantify short and medium range order in a series of borate-rich K, Rb and Cs borophosphate glasses, with a B2O3:P2O5 ratio of 5. At low alkali loadings (ca. <10 mol%), BPO4-like regions segregate from the predominantly borate matrix. Above this level of alkali, a homogeneous mixed network glass forms with depolymerization of phosphate and borate species. The 11B chemical shift of four-coordinated boron is sensitive to the number of bonded phosphate units – as determined by 11B{31P} double resonance NMR and density functional theory calculations – and confirms the presence of phase separation for low alkali glasses.
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Document Type: Research Article

Publication date: February 1, 2013

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