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Si complexes in calcium phosphate biomaterials

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Abstract

Silicon complexes in silicon doped calcium phosphate bioceramics have been studied using 29Si magic angle spinning nuclear magnetic resonance spectroscopy with the objective of identifying the charge compensation mechanisms of silicon dopants. Three different materials have been studied: a multiphase material composed predominantly of a silicon stabilized α-tricalcium phosphate (α-TCP) phase plus a hydroxyapatite (HA) phase, a single phase Si-HA material and a single phase silicon stabilized α-TCP material. NMR results showed that in all three materials the silicon dopants formed Q1 structures in which two silicate tetrahedra share an oxygen, creating an oxygen vacancy which compensated the substitution of two silicon for phosphorus. This finding may explain the phase evolution previously found where silicon stabilized α-TCP is found at low temperature after sintering.

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Acknowledgements

Work supported by the NSERC of Canada and Millenium Biologix Inc. Many discussions with Joel Reid are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Physics, Queen’s University, Kingston, Canada

    P. Gillespie, M. Sayer & M. J. Stott

  2. Department of Chemistry, Queen’s University, Kingston, Canada

    Gang Wu

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  1. P. Gillespie
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  2. Gang Wu
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  3. M. Sayer
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  4. M. J. Stott
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Correspondence to M. J. Stott.

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Gillespie, P., Wu, G., Sayer, M. et al. Si complexes in calcium phosphate biomaterials. J Mater Sci: Mater Med 21, 99–108 (2010). https://doi.org/10.1007/s10856-009-3852-8

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  • DOI: https://doi.org/10.1007/s10856-009-3852-8

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