Micro-Raman and FTIR studies of synthetic and natural apatites

Antonakos, A; Liarokapis, E; Leventouri, T

dc.contributor.author	Antonakos, A	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Leventouri, T	en
dc.date.accessioned	2014-03-01T01:26:40Z
dc.date.available	2014-03-01T01:26:40Z
dc.date.issued	2007	en
dc.identifier.issn	0142-9612	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18162
dc.subject	Apatite structure	en
dc.subject	Carbonate substitution	en
dc.subject	FTIR	en
dc.subject	Hydroxyapatite	en
dc.subject	Micro-Raman spectroscopy	en
dc.subject.classification	Engineering, Biomedical	en
dc.subject.classification	Materials Science, Biomaterials	en
dc.subject.other	Carbonates	en
dc.subject.other	Crystal symmetry	en
dc.subject.other	Fourier transform infrared spectroscopy	en
dc.subject.other	Hydroxyapatite	en
dc.subject.other	Neutron diffraction	en
dc.subject.other	Substitution reactions	en
dc.subject.other	Apatite structure	en
dc.subject.other	Carbonate substitution	en
dc.subject.other	Micro-Raman spectroscopy	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	apatite	en
dc.subject.other	carbonic acid	en
dc.subject.other	hydroxyapatite	en
dc.subject.other	oxygen	en
dc.subject.other	phosphate	en
dc.subject.other	phosphorus	en
dc.subject.other	silicon derivative	en
dc.subject.other	article	en
dc.subject.other	chemical analysis	en
dc.subject.other	chemical structure	en
dc.subject.other	controlled study	en
dc.subject.other	covalent bond	en
dc.subject.other	infrared spectroscopy	en
dc.subject.other	molecular dynamics	en
dc.subject.other	neutron diffraction	en
dc.subject.other	priority journal	en
dc.subject.other	Raman spectrometry	en
dc.subject.other	Apatites	en
dc.subject.other	Carbonates	en
dc.subject.other	Ions	en
dc.subject.other	Spectroscopy, Fourier Transform Infrared	en
dc.subject.other	Spectrum Analysis, Raman	en
dc.title	Micro-Raman and FTIR studies of synthetic and natural apatites	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.biomaterials.2007.02.028	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.biomaterials.2007.02.028	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	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
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Biomaterials	en
dc.identifier.doi	10.1016/j.biomaterials.2007.02.028	en
dc.identifier.isi	ISI:000246546700013	en
dc.identifier.volume	28	en
dc.identifier.issue	19	en
dc.identifier.spage	3043	en
dc.identifier.epage	3054	en