Kiani, Azadeh, Cahill, Lindsay S., Abou Neel, Ensanya Ali, Hanna, John V., Smith, Mark E. and Knowles, Jonathan C.. (2010) Physical properties and MAS-NMR studies of titanium phosphate-based glasses. Materials Chemistry and Physics, Vol.120 (No.1). pp. 68-74. ISSN 0254-0584

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Abstract

In this study, for a series phosphate-based glasses ((P2O5)(0.45)(CaO)(0.3)(Na2O)(0.25-x)(TiO2)(x) 0 <= x <= 0.15), their degradation, ion release, surface and thermal properties have been determined. The results show that adding TiO2 was associated with a significant increase in density and glass transition temperature, but a decrease in degradation rate and ion release. P-31 solid-state magic-angle-spinning nuclear magnetic resonance (MAS-NMR) showed that the local structure of the glasses changes with increasing TiO2 content. As TiO2 is incorporated into the glass, the phosphate connectivity increases as Q(1) units transform to Q(2), confirming that an increase in the nominal TiO2 content correlates unequivocally with an increase in glass stability. As reported for titania-silica gets, Ti4+ is clearly adopting a network former role in these phosphate-based glasses. Na-23 MAS-NMR results corroborate this phenomenon with a marked upfield trend of the Na-23 isotropic chemical shift suggesting that the local Na-O bond distances are decreasing within a more condensed glass network upon increased incorporation of TiO2. (C) 2009 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Materials Chemistry and Physics
Publisher:	Elsevier SA
ISSN:	0254-0584
Official Date:	15 March 2010
Volume:	Vol.120
Number:	No.1
Number of Pages:	7
Page Range:	pp. 68-74
Identification Number:	10.1016/j.matchemphys.2009.10.023
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), NSERC Canada
URI:	http://wrap.warwick.ac.uk/id/eprint/6367

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