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Doping of a high calcium oxide metaphosphate glass with titanium dioxide

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Abou Neel, Ensanya A., Chrzanowski, Wojciech, Valappil, Sabeel P., O'Dell, L. A., Pickup, David M., Smith, Mark E., Newport, Robert J. and Knowles, Jonathan C.. (2009) Doping of a high calcium oxide metaphosphate glass with titanium dioxide. Journal of Non-Crystalline Solids, Vol.355 (No.16-17). pp. 991-1000. ISSN 0022-3093

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Abstract

This study investigates the effect of doping a high calcium oxide containing metaphosphate glass series (CaO)(40)(Na2O)(10)(P2O5)(50) with TiO2 (1, 3, and 5 mol%). TiO2 incorporation increased the density and glass transition temperature while reduced the degradation rate (5 mol% in particular) by twofold compared with (CaO)30 system reported previously. This has been confirmed by ion release and the minimal pH changes. TiP2O7, NaCa(PO3)(3) and CaP2O6 phases were detected for all TiO2-containing ceramics. XPS showed that the surface is composed of Ca, h, and Ti. Ti was recognized mainly as TiO2, but its total amount was lower than theoretical values. P-31 magic angle spinning (MAS) NMR showed a downfield shift of the P-31 lineshape with increasing TiO2, interpreted as an effect of the titanium cation rather than an increase in the phosphate network connectivity. FTIR showed that incorporation of TiO2 increased the strength of the phosphate chains, and the O/P ratio while introducing more Q(1) units into the structure at the expense of the Q(2) units. There were no differences, however, in surface topography roughness and free energies between these glasses. These results suggested that TiO2 and CaO were acting synergistically in producing glasses with controllable bulk and structural properties.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Administration > Vice Chancellor's Office
Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Glass manufacture -- Chemistry, Lime, Titanium dioxide
Journal or Publication Title: Journal of Non-Crystalline Solids
Publisher: Elsevier Science BV
ISSN: 0022-3093
Official Date: 15 June 2009
Volume: Vol.355
Number: No.16-17
Number of Pages: 10
Page Range: pp. 991-1000
Identification Number: 10.1016/j.jnoncrysol.2009.04.016
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Engineering and Physical Sciences Research Council (EPSRC), University of Warwick
Grant number: EP/C004671/1 (EPSRC), EP/C004698/1 (EPSRC), EP/C515560/1 (EPSRC)
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URI: http://wrap.warwick.ac.uk/id/eprint/27748

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