Abstract
The K2O·4GeO2 glass with the highest content of 6-fold coordinated Ge4+ ions (N6) in the K2O-GeO2 system was subjected to the structure analysis by X-ray diffraction using the pair function method. The real K2Ge4O9 crystal and a hypothetical “spiral type” K2Ge4O9 crystal with the same composition and N6 as the glass were selected as the starting structure models. In the former model, the “isolated” GeO6 octahedra are linked to GeO4 tetrahedra in Ge3O9 rings by sharing corner-oxygens. The latter has “isolated” GeO6's linking via oxygens at corners to GeO4's in (GeO3)n chains. The radial distribution function calculated using the latter model agreed well with the observed one as in the case of the Na2O·4GeO2 glass.
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