X-RAY-DIFFRACTION STUDIES ON AGI-AG2O-V2O5 GLASSES

Results of X-ray diffraction studies on glasses in the AgI-Ag2O-V2O5, system are presented. In these glasses, the vanadium atom adopted five -fold coordination of oxygen atoms more frequently than four-fold and six-fold and the V-O distances lay between 1.76 and 1.79 Angstrom. The VOx polyhedra in the glasses shared corners, the V-V distances in the glasses lay between 3.30-3.41 Angstrom. Short and long Ag-O interacti ons were observed. An Ag-I interaction between 2.829-2.876 Angstrom wa s observed, which is characteristic of all AgI based glasses. The I-I distance decreased as the iodine content increased, having a value clo se to that in alpha-AgI at a high AgI content and approaching the valu e of beta-AgI with decreasing AgI content.