Summary
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 anisotropic signal ascribed to a surface CO −2 radical is mainly responsible for the so-called asymmetric ESR signal near g=2. It is argued that this surface signal may still be composite and caused by several very similar CO −2 ions. The consequences for phenomenological ESR studies of calcified tissues are discussed.
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Callens, F.J., Verbeeck, R.M.H., Naessens, D.E. et al. Effect of carbonate content on the ESR spectrum near g=2 of carbonated calciumapatites synthesized from aqueous media. Calcif Tissue Int 44, 114–124 (1989). https://doi.org/10.1007/BF02556470
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DOI: https://doi.org/10.1007/BF02556470