STRUCTURE AND ION-TRANSPORT PROPERTIES OF NA2O-GA2O3-P2O5 GLASSES

The structure of glasses prepared in the Na2O-Ga2O3-P2O5 system was in vestigated by vibrational (IR, Raman) and X-ray absorption spectroscop ies. For the orthophosphate compositions, gallium is found in four-fol d coordination, whereas it is found in six-fold coordination in a meta phosphate glass. For pyro-, tri and tetraphosphate glasses, gallium at oms are distributed on tetrahedral and octahedral sites. Gallium atoms found on octahedral sites are likely chelated by pyrophosphate groups . The ionic conductivity of the glasses depends mainly on their sodium content.