A neutron scattering and nuclear magnetic resonance study of the structure of GeO2-P2O5 glasses |
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Authors: | Zwanziger J W Shaw J L Werner-Zwanziger U Aitken B G |
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Affiliation: | Department of Chemistry and Institute for Research in Materials, Dalhousie University, Halifax, NS, Canada. jzwanzig@dal.ca |
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Abstract: | Germanophosphate (GeO2-P2O5) glasses were studied with neutron diffraction, phosphorus, and oxygen nuclear magnetic resonance, calorimetry, viscosity measurements, and first-principles calculations. These data sets were combined to propose a structural model of GeO2-P2O5 glasses, which includes tetrahedrally coordinated phosphorus, formation of octahedrally coordinated germanium as P2O5 content increases, an absence of trigonally coordinated oxygen, and hence an absence of rutile-like GeO2 domains. The structural model was then used to propose explanations for both the observed composition dependence of the glass transition temperature and the fragility of the GeO2-P2O5 liquids. |
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