Structure and Disorder of Phosphates in Ag2o-Agi-P2o5 Glasses

Abstract

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