A Neutron Scattering and Nuclear Magnetic Resonance Study of the Structure of GeO2−P2O5 Glasses

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 tetr...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2006-10, Vol.110 (41), p.20123-20128
Main Authors: Zwanziger, J. W, Shaw, J. L, Werner-Zwanziger, U, Aitken, B. G
Format: Article
Language:English
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Summary: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.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp062432n