Spectra structure correlations in hydroxy and fluorapatite |
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| Affiliation: | 1. School of Medicine, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Turner Street, London E1 2AD, UK;2. Dental Physical Sciences, Dental Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Mile End Road, London E1 4NS, UK;3. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK;4. School of Chemistry, Purdie Building, North Haugh, St Andrews, UK |
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| Abstract: | The infra-red spectra of synthetic hydroxyapatite, Ca10(PO4)6(OH)2, and mineral fluorapatite, Ca10(PO4)6F2, over the range 4000-250 cm−1 are reported. Comparison with the “free” phosphate ion indicates considerable perturbation of the PO43− group in these solids; the observed absorptions suggest that in both compounds the phosphate symmetry is lowered to the extent predicted by a site symmetry analysis i.e. to C1 in hydroxyapatite and Cs in fluorapatite, but the splitting of degenerate modes is not complete; this effect is more noticeable in fluorapatite. A weak interatomic crystal field arising out of the relatively low density of the atomic packing in these compounds is suggested as a cause of this incomplete removal of degeneracies. The spectroscopic evidence for the existence of hydrogen bonding of the OH … OPO3 type in hydroxyapatite is discussed. |
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