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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. doi:10.1016/j.jnoncrysol.2009.04.016 ISSN 0022-3093.
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WRAP_smith_9774456-vcs_office-041211-jncs_phosphates_(1).pdf - Accepted Version - Requires a PDF viewer. Download (508Kb) |
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 | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Administration > University Executive Office Faculty of Science, Engineering and Medicine > Science > Physics |
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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: |
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Volume: | Vol.355 | ||||
Number: | No.16-17 | ||||
Number of Pages: | 10 | ||||
Page Range: | pp. 991-1000 | ||||
DOI: | 10.1016/j.jnoncrysol.2009.04.016 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Date of first compliant deposit: | 13 December 2015 | ||||
Date of first compliant Open Access: | 13 December 2015 | ||||
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) |
Data sourced from Thomson Reuters' Web of Knowledge
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