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Stoichiometry of Na+- and CO32--containing apatites obtained by hydrolysis of monetite

In this study, a series of Na + - and CO 3 2- -containing calcium hydroxyapatites were prepared under homogeneous precipitation conditions by the hydrolysis of CaHPO 4 in Na 2 CO 3 solutions. A chemical and physical analysis showed that the precipitates were single-phase and well-crystalline B-type carbonated apatites with a carbonate content ranging from 8 to 20 wt %. However, the samples still contained an appreciable amount of water even after prolonged drying under vacuum at 25 o C