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Micro-Raman and FTIR studies of synthetic and natural apatites

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National Technical University of Athens   

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Micro-Raman and FTIR studies of synthetic and natural apatites (EN)
Antonakos, A (EN)
Leventouri, T (EN)
Liarokapis, E (EN)
journalArticle (EN)
2014-03-01T01:26:40Z
2007 (EN)
B-type synthetic carbonate hydroxyapatite (CHAp), natural carbonate fluorapatite (CFAp) and silicon-substituted hydroxyapatite (SiHAp) have been studied by using micro-Raman and infrared (IR) spectroscopy. It was found that while B-type carbonate substitution predominates in carbonate apatites (CAps), A-type is also detected. B-type carbonate substitution causes a broadening of the v(1) P-O stretching mode that is associated with the atomic disorder and lowering of the local symmetry in CAps from C-6h(2) to C-3h. An similar to 15 cm(-1) shift of the v(3c) PO4 stretching IR mode was observed upon decarbonation of the CFAp. Such shift which was confirmed by lattice dynamics calculations points out that the P-O bond lengths on the,mirror plane increase when carbonate leaves the apatite structure. The present results support the substitution mechanism proposed on the basis of neutron powder diffraction studies of the same samples whereby carbonate substitutes on the mirror plane of the phosphate tetrahedron. The intensity ratios of the v(2) IR CO3 and v(1) PO4 bands in samples of various carbonate contents provide a measure of the degree of carbonation for CAps. (C) 2007 Elsevier Ltd. All rights reserved. (EN)
Engineering, Biomedical (EN)
Materials Science, Biomaterials (EN)
Neutron diffraction (EN)
Substitution reactions (EN)
Hydroxyapatite (EN)
Spectroscopy, Fourier Transform Infrared (EN)
apatite (EN)
Carbonate substitution (EN)
FTIR (EN)
neutron diffraction (EN)
Spectrum Analysis, Raman (EN)
carbonic acid (EN)
Raman spectrometry (EN)
Carbonates (EN)
priority journal (EN)
Apatites (EN)
oxygen (EN)
phosphorus (EN)
infrared spectroscopy (EN)
hydroxyapatite (EN)
phosphate (EN)
Ions (EN)
Raman spectroscopy (EN)
molecular dynamics (EN)
Crystal symmetry (EN)
article (EN)
chemical analysis (EN)
silicon derivative (EN)
controlled study (EN)
Fourier transform infrared spectroscopy (EN)
chemical structure (EN)
covalent bond (EN)
Apatite structure (EN)
Micro-Raman spectroscopy (EN)
Biomaterials (EN)
English
ELSEVIER SCI LTD (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά



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