Effect of carbonate content on the ESR spectrum near g=2 of carbonated calciumapatites synthesized from aqueous media

@article{Callens1989EffectOC,
  title={Effect of carbonate content on the ESR spectrum near g=2 of carbonated calciumapatites synthesized from aqueous media},
  author={Freddy J Callens and Dr. R. M. H. Verbeeck and D. E. Naessens and Paul Matthys and E. R. Boesman},
  journal={Calcified Tissue International},
  year={1989},
  volume={44},
  pages={114-124}
}
The ESR spectrum of X-irradiated carbonated apatites synthesized at low temperature was studied as a function of their carbonate content. Using13C-enriched samples, four different carbonate-derived radicals and a surface O− ion could be identified. Isotropic CO 3 − and CO 2 − ions are present at a B site in the apatite lattice, and anisotropic CO 3 − and CO 2 − radicals are located at the surface of the crystallites. Only the isotropic ESR signals increase with increasing carbonate content. The… CONTINUE READING