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

  • David M. Pickup
  • Kate M. Wetherall
  • Jonathan C. Knowles
  • Mark E. Smith
  • Robert J. Newport
Article

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.

Notes

Acknowledgements

The authors wish to acknowledge funding from the EPSRC (EP/C000714, EP/C000633 and GR/T21080) and the use of the EPSRC Chemical Database Service at Daresbury. We thank Mark Roberts of the CCLRC Daresbury Laboratory for his assistance in the use of station 9.1.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • David M. Pickup
    • 1
  • Kate M. Wetherall
    • 1
  • Jonathan C. Knowles
    • 2
  • Mark E. Smith
    • 3
  • Robert J. Newport
    • 1
  1. 1.School of Physical SciencesUniversity of KentCanterburyUK
  2. 2.Division of Biomaterials and Tissue EngineeringUCL Eastman Dental InstituteLondonUK
  3. 3.Department of PhysicsUniversity of WarwickCoventryUK

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