Structural properties of sodium phosphate glasses from 23Na → 31P cross-polarization NMR
作者： S Prabakar , R.M Wenslow , K.T Mueller
DOI: 10.1016/S0022-3093(99)00624-9
关键词: Pyrophosphate 、 Heteronuclear molecule 、 Inorganic chemistry 、 Coordination sphere 、 Magnetization 、 Phosphate 、 Sodium 、 Chemistry 、 Crystallography 、 Metaphosphate 、 Ion
摘要: Abstract One-dimensional heteronuclear correlation solid-state nuclear magnetic resonance (NMR) experiments are utilized to determine local structural changes in sodium phosphate glass compositions with ratios of Na/P 0.25, 0.78, 1 and 1.3. Glasses containing only Q2 (metaphosphate composition), Q1 (between meta- pyrophosphate compositions), Q3 (ultraphosphate region) have been investigated. 23Na → 31P cross-polarization magic-angle-spinning (CPMAS) NMR detects direct interactions between distinct phosphorus sites nuclei the second coordination sphere. Variable-contact CPMAS provide additional information about association specific sites. Time constants describing transfer magnetization from found be affected by ion concentration ultraphosphate glasses, an important finding these investigations is degree ions glasses.
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