The effect of composition on the structure of sodium borophosphate glasses

Carta, Daniela and Qiu, Dong and Guerry, Paul and Ahmed, Ifty and Abou Neel, Ensanya A. and Knowles, Jonathan C. and Smith, Mark E. and Newport, Robert J. (2008) The effect of composition on the structure of sodium borophosphate glasses. Journal of Non-Crystalline Solids, 354 (31). pp. 3671-3677. ISSN 0022-3093. (Access to this publication is restricted)

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Abstract

Glasses in the system 40(P2O5)-x(B2O3)-(60-x)(Na2O) (10 <= x <= 30 mol%) have been prepared by the melt-quenching technique. Thermal properties were studied using differential thermal analysis and the relationship between composition and thermal stability was obtained. Structural characterization was achieved by a combination of experimental data (infrared and Raman spectroscopy, B-11 and P-31 solid state NMR). In particular, variations in the phosphate network structure upon addition of B2O3 and Na2O were investigated. Analysis of the data indicates that with increasing B2O3 content and decreasing Na2O, the glass network shows increasing levels of cross-linking between phosphate and borate units. Evidence of direct B-O-P bonds was observed. In the compositional range investigated, borate groups contain boron almost exclusively in four-fold coordination.

Item Type: Article
Uncontrolled keywords: phosphates
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: Suzanne Duffy
Date Deposited: 04 Feb 2009 11:51
Last Modified: 07 Apr 2014 11:32
Resource URI: http://kar.kent.ac.uk/id/eprint/14870 (The current URI for this page, for reference purposes)
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