Structural Model of K₂O-GeO₂-P₂O₅ Glasses Based on Diffraction Results
An increase of the Ge-O coordination numbers (NGeO) from 4 to 5 with decreasing GeO2 content is obtained by diffraction on K2O-GeO2-P2O5 glasses of GeO2 fractions ≥ 50 mole%. First sharp diffraction peaks (FSDP) appear at small scattering vectors Q of 7.5 nm-1. A structural model is already reported which explains this behaviour for that sample (25K2O-50GeO2-25P2O5) with the FSDP reaching maximum intensity and NGeO = ~5. Here, this model gets support by considering the detailed fractions of the structural groups which exist at the corresponding glass stoichiometry. Structures similar to this model are not known of the crystalline germanophosphate compounds.
U. Hoppe et al., "Structural Model of K₂O-GeO₂-P₂O₅ Glasses Based on Diffraction Results," Advanced Materials Research, Trans Tech Publications, Apr 2008.
Materials Science and Engineering
Keywords and Phrases
X-Ray Diffraction; Germanophosphate Glass; Medium-Range Order; Neutron Diffraction; Short-Range Order
Article - Journal
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