Apatite and Octa-Calcium Phosphate: Effects of Carbon Dioxide and Halogens on Formation

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Science  30 Dec 1966:
Vol. 154, Issue 3757, pp. 1660-1661
DOI: 10.1126/science.154.3757.1660


Octa-calcium phosphate forms instead of apatite under a high partial pressure of CO2in solution almost neutral in pH, containing chloride ions or wholly lacking halogens. However, in solutions containing fluoride ions, apatite forms under the same conditions. Fluoride also increase the crystallinity of the formed apatite.