Abstract
Spectroscopic properties of fluoridated CO3-apatites were studied by means of infrared (IR) absorption analysis. The peak of the IR band caused by CO 3 2− ions at 875 cm−1 shifted to a lower frequency with the degree of fluoridation. This result suggests that there is a significant interaction between F and CO 3 2− ions in the apatite crystals. The interaction of both these ions is discussed with regard to the solubility behavior of fluoridated CO3-apatites in the acetate buffer solution at pH 4.0 and at 37°C. Solubility of these fluoridated CO3-apatites approached that of fluoridated hydroxyapatites at high fluoride content.

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