Abstract
Brushite, forming tabular crystals, has been precipitated at 25°C in the presence of each of 14 different di- and trivalent metal ions. The effect of additives was pH-dependent, which could be related to the presence or absence of amorphous precipitate. Zn favoured aggregates, and the transition metals with the exceptions of Mn(II), Co(II) and Cu(II) favoured irregular growth. Zn inhibited lateral growth, as did Cd and Cr(III) at low and Cu(II) at high pH. Several of these ions have a marked effect on the solvent-mediated phase transformation of brushite to more basic calcium phosphates even at concentrations below 10 μM. Cu(II) and Zn are strong inhibitors, whereas Pb(II) is a moderate promotor. This is explained by the formation of nuclei with apatite/pyromorphite structure, i.e. (Ca,Pb)5 OH(PO4)3.
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Madsen, H.E.L., Pedersen, J.B. (2002). Influence of Foreign Metal Ions on Crystal Morphology and Transformation of Brushite (CaHPO4.2H2O). In: Amjad, Z. (eds) Advances in Crystal Growth Inhibition Technologies. Springer, Boston, MA. https://doi.org/10.1007/0-306-46924-3_1
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DOI: https://doi.org/10.1007/0-306-46924-3_1
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