FT-IR spectroscopy of fluoro-substituted hydroxyapatite: strengths and limitations

Rintoul, Llew, Wentrup-Byrne, Edeline, Suzuki, Shuko, & Grondahl, Lisbeth (2007) FT-IR spectroscopy of fluoro-substituted hydroxyapatite: strengths and limitations. Journal of Materials Science: Materials in Medicine, 18(9), pp. 1701-1709.

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Fluoro substituted hydroxyapatite (FHAp) samples were prepared by a cyclic pH method. Both calcined and uncalcined samples were subjected to elemental analysis (F, Ca, P) and X-ray diffraction (XRD) analysis to verify composition and phase purity. Good correlation between a-axis parameters and fluoride ion content was found for calcined samples, however, for uncalcined samples the fluoride ion content was higher than estimated from the a-axis values. Fourier transform infra red (FT-IR) spectroscopy analysis of the calcined samples showed OH band shifts and splitting in accordance with F-HO interactions affecting the OH vibration. We conclude that the OH libration (620–780 cm-1 range) is more suited for estimation of fluoride ion content than the OH stretching. In contrast, uncalcined samples all displayed FT-IR spectra similar to that of hydroxyapatite (HAp) despite the presence of fluoride ions (18–73%). FT-IR emission spectroscopy was used to probe the changes occurring in the FT-IR spectra of HAp and FHAp samples upon heating. Interpretation of the spectral changes occurring during heating to 1,000 degrees Celsius and subsequent cooling is given. Room temperature spectra of samples heated to various temperatures was used to determine the temperature necessary to produce FT-IR spectra displaying the expected OH bands. A model accounting for the combined observations is proposed.

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ID Code: 14939
Item Type: Journal Article
Refereed: Yes
DOI: 10.1007/s10856-007-3052-3
ISSN: 1573-4838
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200) > Bioinorganic Chemistry (030201)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2007 Springer
Copyright Statement: The original publication is available at SpringerLink
Deposited On: 23 Sep 2008 00:00
Last Modified: 25 Feb 2013 03:50

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