Abstract
Two-dimensional 27Al/ 31P cross-polarization magic-angle spinning (CPMAS) NMR experiments are performed on sodium aluminophosphate glasses in the xNaAlO 2·(1− x)NaPO 3 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. Q 1 0, Q 3 0 and Q 2 1 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
