LOCAL STRUCTURE OF Ge IN BINARY OXIDE GLASSES BY EXAFS

The coordination number and distances around a Ge atom in binary oxide glasses BiO_1.5-GeO₂ and PO _2.5-GeO₂ have been measured by EXAFS. The results show that Ge-O tetrahedron network in GeO₂ rich BiO_1.5-GeO₂ glass is much like that in amorphous GeO₂ but that in PO_2.5-GeO₂ glass it is more disordered.