Structure and properties of CO- sub(2) centers in biological and synthetic hydroxyapatite

Biological and synthetic carbonate-containing hydroxyapatites (HAP) were exposed to [gamma]- rays and studied by the electron paramagnetic resonance (EPR) and the electron-nuclear double resonance (ENDOR). Two types of CO- sub(2) radicals - axial and orthorhombic ones - were shown to be the dominati...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2010-01, Vol.15, p.1-10
Main Authors: Rudko, V V, Baran, N P, Vorona, I P, Ishchenko, S S, Okulov, S M, Chumakova, L S
Format: Article
Language:English
Subjects:
Biological
Carbonates
Defects
Electron paramagnetic resonance
Formations
Hydroxyapatite
Molecular ions
Radicals
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Summary:Biological and synthetic carbonate-containing hydroxyapatites (HAP) were exposed to [gamma]- rays and studied by the electron paramagnetic resonance (EPR) and the electron-nuclear double resonance (ENDOR). Two types of CO- sub(2) radicals - axial and orthorhombic ones - were shown to be the dominating [gamma]-induced paramagnetic centers in the abovementioned materials. The study of metastable radiation-induced centers allowed to identify these defects with molecular ions CO super(3-) sub(3) in B position. The mechanism of CO- sub(2) radical formation was proposed to be CO super(2-) sub(3) [arrowright] CO super(3-) sub(3) [arrowright] CO- sub(2).
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/15/1/012032