Abstract
The authors have investigated the structure of binary lead phosphate glasses using 1D {sup 31}P MAS and 2D {sup 31}P double-quantum NMR. The distribution of the Q{sub n} phosphate species, determined from the simulation of 1D MAS spectra, indicates a significant disproportionation reaction (2Q{sub n} {leftrightarrow} Q{sub n+1} + Q{sub n{minus}1}) near the pyrophosphate composition. As demonstrated on crystalline reference samples, 2D double-quantum experiments can be used to determine the connectivities between Q{sub n} groups. This allows the authors to probe the phosphorus connectivity scheme in the glass network and to show that the Q{sub n} chemical shift is influenced by the type of the bonded PO{sub 4} tetrahedron. By analyzing quantitative 1D MAS spectra and 2D double-quantum spectra, the phosphorus connectivity scheme in the glass structure and its evolution with composition have been determined.
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