Structural Model of K2O-GeO2-P2O5 Glasses Based on Diffraction Results

U. Hoppe; G. Walter; R.K. Brow; N.P. Wyckoff

doi:10.4028/www.scientific.net/AMR.39-40.69

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Structural Changes in Alkali Depleted Alkali-Silicate Glass – MD Study
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 39-40Structural Model of K2O-GeO2-P2O5 Glasses Based on...

Structural Model of K₂O-GeO₂-P₂O₅Glasses Based on Diffraction Results

Abstract:

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.