Abstract
In order to clarify the structural change in GeO2 glass due to the addition of alkali metal oxides, the radial distribution functions for Na2O-GeO2 glasses containing 0, 10, 20 mol%Na2O were determined by X-ray diffraction measurement.The results are summarized as follows:(1) The structure of GeO2 glass was composed of tetrahedral GeO4 basic structural units with an average Ge-O distance of 1.74×10−10 m. The average structure of GeO2 glass in the short range resembled that of the quartz modification.(2) Analysis of the radial distribution functions indicated that oxygen coordinations around some of Ge4+ ions in Na2O-GeO2 glasses changed from GeO4 tetrahedra to GeO6 octahedra when Na2O was added up to 20 mol%.
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