Abstract
As a basic study with the aim of its application to biomaterials, fluoridated CO3apatite was synthesized by supplying F--containing solution initially, followed by F--free solution. This heterogeneously synthesized fluoridated CO3apatite had half of the maximum fluoride content of fluorapatite. The (300) reflection peak of the apatite was split. However, it was not a mechanical mixture of CO3 apatite and fluorCO3apatite. SEM observation revealed that it had many small crystals, similar to those of homogeneous CO3apatite, adhering to the larger hexagonal crystals which were also similar to those of homogeneous fluorCO3apatite. Spectroscopy attached to the SEM showed a lower fluoride intensity in its spectrum than that of fluorCO3apatite. After solubility experiment, the small crystals adhered to the surface almost disappeared. When magnesium ions were added to the source solution for synthesis, a similar tendency was noted. These results suggested that heterogeneous fluoridated CO3 apatite, fluor CO3apatite covered with CO3apatite, was formed. The simple two-step supply system used in this study is expected to be applicable in the synthesis of hybrid-type apatites with multilayers.
