Effect of carbonate content on the ESR spectrum near g = 2 of carbonated calciumapatites synthesized from aqueous media.
Calcif Tissue Int
; 44(2): 114-24, 1989 Feb.
Article
em En
| MEDLINE
| ID: mdl-2537133
ABSTRACT
The ESR spectrum of X-irradiated carbonated apatites synthesized at low temperature was studied as a function of their carbonate content. Using 13C-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.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Apatitas
/
Carbonatos
/
Espectroscopia de Ressonância de Spin Eletrônica
Tipo de estudo:
Qualitative_research
Limite:
Humans
Idioma:
En
Revista:
Calcif Tissue Int
Ano de publicação:
1989
Tipo de documento:
Article
País de afiliação:
Bélgica