Structural Model of K2O-GeO2-P2O5 Glasses Based on Diffraction Results |
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| Journal | Advanced Materials Research (Volumes 39 - 40) |
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| Volume | Glass – The Challenge for the 21st Century |
| Edited by | M. Liška, D. Galusek, R. Klement and V. Petrušková |
| Pages | 69-72 |
| DOI | 10.4028/www.scientific.net/AMR.39-40.69 |
| Citation | U. Hoppe et al., 2008, Advanced Materials Research, 39-40, 69 |
| Online since | April, 2008 |
| Authors | U. Hoppe, G. Walter, R.K. Brow, N.P. Wyckoff |
| Keywords | Germanophosphate Glass, Medium Range Order, Neutron Diffraction, Short Range Order (SRO), X-Ray Diffraction (XRD) |
| 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. |
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