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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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Official URL: http://dx.doi.org/10.1016/j.jnoncrysol.2009.04.016

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

Dates:

Date	Event
15 June 2009	Published

Volume:

Vol.355

Number:

No.16-17

Number of Pages:

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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