| Title | Preparation and characterization of fluoride-substituted apatites |
| Publication Type | Journal Article |
| 1997 |
| Authors | Jha, LJ |
| Journal | Journal of Materials Science: Materials in MedicineJ. Mater. Sci. Mater. Med. |
| Volume | 8 |
| Issue | 4 |
| Pagination | 185 - 191 |
| Date Published | 1997/// |
| 09574530 (ISSN) |
| Apatites, Chromatographic analysis, Composition effects, crystal structure, Fluorine compounds, Fourier transform infrared spectroscopy, Ion chromatography, Phase composition, Phase purity, Phosphate minerals, Precipitation (chemical), Thermal effects, transmission electron microscopy, X ray diffraction analysis |
| Apatites were prepared with three different fluoride concentrations: 0.0 mM (pure hydroxyapatite) 2.5 mM and 5 mM. Reactions were performed in aqueous medium using a reaction between diammonium orthophosphate and calcium nitrate 4-hydrate and ammonium fluoride at temperatures of 3°, 25°, 60° and 90°C. The effects of reaction temperature and fluoride concentration on the crystal morphology, phase purity and crystallinity of the precipitates were observed, using transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and ion chromatography. Transmission electron micrographs revealed that the crystallites precipitated at 3°C were spheroidal, but became increasingly acicular with increasing precipitation temperature. X-ray diffraction results indicated that all the materials produced were phase pure and that the crystallinity of apatites prepared at higher precipitation temperatures was higher than those prepared at lower precipitation temperatures. A significant difference in the a-axis dimension of fluoride-substituted apatites was observed, as compared to hydroxyapatite. FTIR spectroscopy revealed a hydroxyl band at 3568 cm |
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