Structural Model of K₂O-GeO₂-P₂O₅ Glasses 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.

Department(s)

Materials Science and Engineering

Keywords and Phrases

X-Ray Diffraction; Germanophosphate Glass; Medium-Range Order; Neutron Diffraction; Short-Range Order

International Standard Serial Number (ISSN)

1022-6680

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2008 Trans Tech Publications, All rights reserved.

Publication Date

01 Apr 2008

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