Abstract
A series of 10 binary zinc phosphate glasses with composition xZnO+(1− x)P 2O 5 (0.35≤ x≤0.80) is studied by means of two-dimensional (2D) solid and liquid state 31P nuclear magnetic resonance (NMR). Double quantum (DQ) filtering method is used to probe 31P– 31P connectivities through dipolar interactions in solid samples. Similar information is obtained using the correlation spectroscopy (COSY) experiment in solution. It is shown that these 2D NMR methods are capable of scrutinizing the evolution of glass structure versus x with improved precision. Varied relative concentrations of dimers, short or long branched chains and ring structures are found in glasses with different composition. Average chain length in the glasses is determined from the NMR results and compared with HPLC data and theoretical predictions. Finally, the evolution of glass structure is studied as a function of the synthesis temperature.
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