Doping of a high calcium oxide metaphosphate glass with titanium dioxide

Abou Neel, Ensanya A. and Chrzanowski, W. and Valappil, S and O'Dell, L and Pickup, David M and Smith, Mark E. and Newport, Robert J. and Knowles, Jonathan C. (2009) Doping of a high calcium oxide metaphosphate glass with titanium dioxide. JOURNAL OF NON-CRYSTALLINE SOLIDS , 355 (16-17). pp. 991-1000. ISSN 0022-3093 . (Full text available)

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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: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: J.M. Smith
Date Deposited: 18 Aug 2009 11:20
Last Modified: 09 Apr 2014 11:17
Resource URI: http://kar.kent.ac.uk/id/eprint/22314 (The current URI for this page, for reference purposes)
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