publication . Article . 2008

A High Energy X-ray Diffraction, 31P and 11B solid state NMR study of the structure of aged sodium borophosphate glasses

Qiu, Dong; Guerry, Paul; Ahmed, Ifty; Pickup, David M.; Carta, Daniela; Knowles, Jonathan C.; Smith, Mark E.; Newport, Robert J.;
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  • Published: 01 Jan 2008 Journal: Materials Chemistry and Physics, volume 111, pages 455-462 (issn: 0254-0584, Copyright policy)
  • Publisher: Elsevier BV
  • Country: United Kingdom
Abstract
The structure of aged melt-quenched sodium borophosphate glasses of composition (P2O5)(40)(B2O3)(x)(Na2O)(60-x) (with x in the range 10-40) has been studied by high-energy X-ray diffraction (HEXRD), P-31 and B-11 magic angle spinning (MAS) NMR. Similar to the fresh samples, both P-O-P and P-O-B linkages are found to be present in these glasses. All three techniques show that the cross-linking between borate and phosphate units increases with boron oxide content. Distinctively upon aging, the glass is found to hydrolyze causing the network to degrade. At the same time, crystalline phases are now also observed. XRD and DTA show that the samples have a higher tende...
Subjects
free text keywords: General Materials Science, Condensed Matter Physics, Crystallization, law.invention, law, Solid-state nuclear magnetic resonance, Sodium, chemistry.chemical_element, chemistry, Crystal, Crystallography, X-ray crystallography, Materials science, Boron, Boron oxide, Magic angle spinning, Q
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