Mapping aluminum/phosphorus connectivities in aluminophosphate glasses

摘要: Abstract Two-dimensional 27Al/31P cross-polarization magic-angle spinning (CPMAS) NMR experiments are performed on sodium aluminophosphate glasses in the xNaAlO2·(1−x)NaPO3 compositional range, providing direct detection of particular aluminum species connected to specific phosphorus species. In particular, spectral-editing capabilities two-dimensional allow elucidation resonances that strongly correlated four-, five- and six-coordinate Results from contour plots projections spectra along 31P dimension assignment phosphate structures cannot be directly assigned one-dimensional MAS spectra. Q10, Q30 Q21 have all been identified these tetrahedral bonded each moieties. Changes phosphate/aluminate ordering also monitored by inspection subspectra CPMAS experiments, demonstrating a change aluminum/phosphorus connectivity changes molar composition.