Synthesis and structural characterization of P2O5-CaO-Na2O sol-gel materials

Carta, Daniela and Knowles, Jonathan C. and Smith, Mark E. and Newport, Robert J. (2007) Synthesis and structural characterization of P2O5-CaO-Na2O sol-gel materials. Journal of Non-Crystalline Solids, 353 (11-12). pp. 1141-1149. ISSN 0022-3093. (Access to this publication is restricted)

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http://dx.doi.org/10.1016/j.jnoncrysol.2006.12.093

Abstract

Ternary phosphate-based glasses in the system P2O5-CaO-Na2O were synthesized using the sol-gel approach. Glasses in this system have the potential for use as bioactive materials. A mixture of mono- and dialkyl phosphate PO(OH)(3-x)(OC2H5)(x) (x=1,2) and alkoxides of sodium and calcium in an ethylene glycol solution were used as precursors. One of the compositions has also been synthesized by sonocatalysis (application of ultrasonic vibration to the sol). The systems synthesized, which remain fully amorphous even after calcination at 400 degrees C given the appropriate composition, have been characterized using X-ray diffraction (XRD). Thermal properties have been examined by means of thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The structure of the phosphate network has been studied as a function of composition using Fourier transform infrared spectroscopy (FT-IR) and P-31 MAS NMR. (C) 2007 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled keywords: phosphates; sol-gels (xerogels)
Subjects: Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: Stephen Holland
Date Deposited: 19 Dec 2007 18:58
Last Modified: 02 May 2014 16:04
Resource URI: http://kar.kent.ac.uk/id/eprint/1466 (The current URI for this page, for reference purposes)
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