WATER-CONTENT AND THERMAL-PROPERTIES OF GLASSY SILVER METAPHOSPHATE -ROLE OF THE PREPARATION

Thermal and structural properties of silver metaphosphate glasses prep ared by quenching liquids from temperatures in the 500-700-degrees-C r ange melted from AgPO3 Crystals or stoichiometric mixtures of AgNO3 an d NH4H2PO4 are compared. Thermal analysis and 31P-NMR MAS techniques s how that glasses made from AgPO3 Crystals have a very low content of s tructural water, and a nearly meta-composition, while glasses made fro m nitrate-ammonium phosphate give thermal properties and water content that display a substantial dependence upon temperature and duration o f annealing.