Mapping aluminum/phosphorus connectivities in aluminophosphate glasses

J. M. Egan, R. M. Wenslow, K. T. Mueller

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


Two-dimensional 27Al/3P 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, the spectral-editing capabilities of two-dimensional experiments allow the elucidation of phosphorus resonances that are strongly correlated to four-, five and six-coordinate aluminum species. Results from two-dimensional contour plots and projections of spectra along the 31P dimension allow the assignment of phosphate structures that cannot be directly assigned from one-dimensional 31P MAS spectra. Q10, Q30 and Q21 species have all been identified in these aluminophosphate glasses and tetrahedral aluminum species are bonded to each of these phosphate moieties. Changes in the phosphate/aluminate ordering are also monitored by inspection of the phosphorus subspectra of the two-dimensional CPMAS experiments, demonstrating a change in aluminum/phosphorus connectivity correlated to changes in molar composition.

Original languageEnglish (US)
Pages (from-to)115-126
Number of pages12
JournalJournal of Non-Crystalline Solids
Issue number1
StatePublished - Jan 2000

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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