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


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1989-03

AUTHORS

F. J. Callens, R. M. H. Verbeeck, D. E. Naessens, P. F. A. Matthys, E. R. Boesman

ABSTRACT

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 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... »

PAGES

114-124

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02556470

DOI

http://dx.doi.org/10.1007/bf02556470

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1021964152

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/2537133


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