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Ti K-edge XANES study of the local environment of titanium in bioresorbable TiO2–CaO–Na2O–P2O5 glasses

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Abstract

Ti K-edge XANES (X-ray absorption near edge structure) spectroscopy has been used to study the local coordination of titanium in biocompatible and bioresorbable TiO2–CaO–Na2O–P2O5 glasses. Both conventional melt-quenched glasses of composition (TiO2) x (CaO)0.30(Na2O)(0.20−x)(P2O5)0.50, where x = 0.01, 0.03 and 0.05, and sol–gel derived (TiO2)0.25(CaO)0.25(P2O5)0.50 glass have been studied. The results show that in all the materials studied, titanium is surrounded by an octahedron of oxygen atoms. Further analysis reveals that the TiO6 site in the amorphous samples is not heavily distorted relative to that in rutile, anatase or CaSiTiO5. The spectra from the (TiO2)0.25(CaO)0.25(P2O5)0.50 sol–gel samples reveal greater distortion in the TiO6 site in the dried gel compared to the heat-treated sol–gel glass. The XANES spectra from melt-quenched glass samples soaked in distilled water for various times do not shown any evidence of degradation of the titanium site over periods of up to 14 days.

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Acknowledgements

The authors wish to acknowledge funding from the EPSRC (EP/C000714, EP/C000633 and GR/T21080). We thank Steve Fiddy of the STFC Daresbury Laboratory for his assistance in the use of station 7.1.

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Authors and Affiliations

  1. School of Physical Sciences, University of Kent, Canterbury, CT2 7NH, UK

    David M. Pickup, Robert M. Moss, Kate M. Wetherall & Robert J. Newport

  2. Division of Biomaterials and Tissue Engineering, UCL Eastman Dental Institute, 256 Gray’s Inn Road, London, WC1X 8LD, UK

    Ensanya A. Abou Neel & Jonathan C. Knowles

  3. Department of Physics, University of Warwick, Coventry, CV4 7AL, UK

    Paul Guerry & Mark E. Smith

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  1. David M. Pickup
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  2. Ensanya A. Abou Neel
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Correspondence to David M. Pickup.

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Pickup, D.M., Abou Neel, E.A., Moss, R.M. et al. Ti K-edge XANES study of the local environment of titanium in bioresorbable TiO2–CaO–Na2O–P2O5 glasses. J Mater Sci: Mater Med 19, 1681–1685 (2008). https://doi.org/10.1007/s10856-007-3342-9

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  • DOI: https://doi.org/10.1007/s10856-007-3342-9

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