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

Qiu, D, Guerry, P, Ahmed, I, Carta, Daniela, Knowles, JC, Pickup, DM, Smith, ME and Newport, R J (2008) A High Energy X-ray Diffraction, 31P and 11B solid state NMR study of the structure of aged sodium borophosphate glasses Materials Chemistry and Physics, 111 (2-3). pp. 455-462.

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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), 31P and 11B 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 tendency towards crystallization with increasing boron oxide content upon exposed to moisture. 31P and 11B MAS NMR results are in agreement with these findings. TGA data show that samples with higher boron oxide content take up more moisture upon aging, suggesting that crystallization may be associated with glass hydrolysis. HEXRD results also suggest that sodium ions are preferentially associated with borate units with increasing boron oxide content. © 2008 Elsevier B.V. All rights reserved.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Qiu, DUNSPECIFIEDUNSPECIFIED
Guerry, PUNSPECIFIEDUNSPECIFIED
Ahmed, IUNSPECIFIEDUNSPECIFIED
Carta, Danielad.carta@surrey.ac.ukUNSPECIFIED
Knowles, JCUNSPECIFIEDUNSPECIFIED
Pickup, DMUNSPECIFIEDUNSPECIFIED
Smith, MEUNSPECIFIEDUNSPECIFIED
Newport, R JUNSPECIFIEDUNSPECIFIED
Date : 4 June 2008
Identification Number : 10.1016/j.matchemphys.2008.04.045
Uncontrolled Keywords : Sodium borophosphate glass; High-energy X-ray diffraction; Solid-state NMR
Depositing User : Jane Hindle
Date Deposited : 01 Sep 2017 12:15
Last Modified : 04 Sep 2017 15:23
URI: http://epubs.surrey.ac.uk/id/eprint/842127

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