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- W2081773223 abstract "The concentrations of non-bridging oxygens (NBO) in oxide glasses has major effects on their properties and on those of their precursor glass melts. In borate and borosilicate glasses, the presence of NBO bonded to boron has generally been inferred from 11B NMR spectra and mass balance considerations. Here we report the direct observation of such NBO using 17O MAS and 3QMAS techniques, and compare estimates of their populations with those derived from high-resolution 11B MAS spectra. For the latter, two independent methods are used, based on the ratios of trigonal to tetrahedral boron and on the concentrations of trigonal boron sites with large quadrupolar asymmetry parameters. We include data on crystalline sodium pyroborate (Na4B2O5) and sodium metaborate (NaBO2), and several sodium and barium borate glasses. 17O chemical shifts and quadrupolar coupling constants for NBO bonded to boron vary considerably depending on their coordination environment. In borosilicates, peaks for this species may be hidden by overlap with B-O-Si or Si-O-Si resonances." @default.
- W2081773223 created "2016-06-24" @default.
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- W2081773223 date "2000-05-01" @default.
- W2081773223 modified "2023-10-17" @default.
- W2081773223 title "Non-bridging oxygens in borate glasses: characterization by 11B and 17O MAS and 3QMAS NMR" @default.
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- W2081773223 doi "https://doi.org/10.1016/s0926-2040(00)00050-3" @default.
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