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Colour centres in plasma-sprayed hydroxyapatite.

P Sharrock1, G Bonel

  • 1Université Paul Sabatier, Laboratoire de Chimie Inorganique, Toulouse, France.

Biomaterials
|January 1, 1992
PubMed
Summary

Pure hydroxyapatite is diamagnetic, but plasma-sprayed coatings reveal paramagnetic defects. Irradiation induces an O2- anion defect, observable via electron paramagnetic resonance (EPR) spectroscopy.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Biomaterials

Background:

  • Hydroxyapatite is a key biomaterial, typically diamagnetic and EPR-silent.
  • Plasma-sprayed hydroxyapatite coatings can exhibit unexpected paramagnetic properties.

Purpose of the Study:

  • To investigate the nature of paramagnetic point-defects in plasma-sprayed hydroxyapatite coatings.
  • To characterize defect-induced EPR signals and their response to irradiation and annealing.

Main Methods:

  • Electron Paramagnetic Resonance (EPR) spectroscopy was employed.
  • Analysis of anisotropic EPR parameters (g1, g2, g3) was performed.
  • The effects of irradiation and thermal annealing on EPR spectra were studied.

Main Results:

  • Pure hydroxyapatite showed no EPR signal.
  • Plasma-sprayed coatings exhibited paramagnetic point-defects.
  • Irradiation generated an O2- anion defect adjacent to a calcium vacancy, with specific anisotropic g-values.
  • Annealing caused EPR signals and coloration to diminish.

Conclusions:

  • The observed EPR signals are attributed to point-defects within the hydroxyapatite crystal structure.
  • These defects, particularly the O2- anion adjacent to a calcium vacancy, influence the material's properties.
  • Understanding these defects is crucial for controlling the performance of hydroxyapatite coatings.

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