Carbonate in Hydroxylapatite

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Science  29 Jan 1965:
Vol. 147, Issue 3657, pp. 501-502
DOI: 10.1126/science.147.3657.501


Unit cell dimensions of hydroxylapatite synthesized hydrothermally are a0 = 9.426 Å and c0 = 6.885 Å, whereas carbonate apatite (2.29 CO2) gave a0 = 9.436 Å and c0 = 6.885 Å. A deficiency of both calcium and phosphorus in the carbonate apatite suggests a coupled substitution of hydronium and carbonate ions in the structure.