STRUCTURE AND DISORDER OF PHOSPHATES IN AG2O-AGI-P2O5 GLASSES

We directly probe the microstructure of the different phosphates in se veral glasses in the Ag2O-AgI-P2O5 system, by means of variable angle correlation NMR spectroscopy. This two-dimensional experiment separate s the chemical-shift powder patterns of the phosphorus sites according to their isotropic chemical shifts. We have thus determined all chemi cal-shift tensor elements for each chemically distinct phosphorus site in these glasses, and their variation within each site. Our results y ield a precise description of the phosphate types and geometries in th ese glasses.