Sol-gel preparation and high-energy XRD study of (CaO)(x)(TiO2)(0.5-x)(P2O5)(0.5) glasses (x=0 and 0.25)

Pickup, David M. and Wetherall, Karen and Knowles, Jonathan C. and Smith, Mark E. and Newport, Robert J. (2007) Sol-gel preparation and high-energy XRD study of (CaO)(x)(TiO2)(0.5-x)(P2O5)(0.5) glasses (x=0 and 0.25). Journal of Materials Science: Materials in Medicine, 19 (4). pp. 1661-1668. ISSN 0957-4530. (Access to this publication is restricted)

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http://dx.doi.org/10.1007/s10856-007-3259-3

Abstract

Glasses from the CaO-TiO2-P2O5 system have potential use in biomedical applications. Here a method for the sol-gel synthesis of the ternary glass (CaO)(0.25)(TiO2)(0.25)(P2O5)(0.5) has been developed. The structures of the dried gel and heat-treated glass were studied using high-energy X-ray diffraction. The structure of the binary (TiO2)(0.5)(P2O5)(0.5) sol-gel was studied for comparison. The results reveal that the heat-treated (CaO)(0.25)(TiO2)(0.25)(P2O5)(0.5) glass has a structure based on chains and rings of PO4 tetrahedra, held together by a combination of electrostatic interaction with Ca2+ ions and by corner-sharing oxygen atoms with TiO6 octahedra. In contrast, the (TiO2)(0.5)(P2O5)(0.5) glass has a structure based on isolated P2O7 units linked together by corner-sharing with TiO6 groups. The results suggest that both the dried gels possess open porous structures. For the (CaO)(0.25)(TiO2)(0.25)(P2O5)(0.5) sample there is a significant increase in Ca-O coordination number with heat treatment.

Item Type: Article
Additional information: 21st European Conference on Biomaterials Brighton, ENGLAND, SEP 09-13, 2007
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: J.M. Smith
Date Deposited: 15 May 2009 11:48
Last Modified: 30 May 2014 15:56
Resource URI: http://kar.kent.ac.uk/id/eprint/15961 (The current URI for this page, for reference purposes)
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