The coordination nwnber and distances around a Ge atom in binary oxide glasses BiOlS5-GeO2 and POeS5-GeO2 have been measured by EXAFS. results show that Ge-0 tetrahedron network in Ge02 rich Bi01.5-Ge02 glass is much like that in amorphous Ge02, but that in POZe5-Ge02 glass it is more disordered.
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