Ontology type: schema:ScholarlyArticle
1989-03
AUTHORSF. J. Callens, R. M. H. Verbeeck, D. E. Naessens, P. F. A. Matthys, E. R. Boesman
ABSTRACTThe 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 CO3− and CO2− ions are present at a B site in the apatite lattice, and anisotropic CO3− and CO2− 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 CO2− 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 CO2− ions. The consequences for phenomenological ESR studies of calcified tissues are discussed. More... »
PAGES114-124
http://scigraph.springernature.com/pub.10.1007/bf02556470
DOIhttp://dx.doi.org/10.1007/bf02556470
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/2537133
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