Mixed calcium-magnesium pre-nucleation clusters enrich calcium

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2012
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Verch, Andreas
Antonietti, Markus
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It is demonstrated that magnesium and carbonate ions can form pre-nucleation clusters in analogy to calcium carbonate. If a mixed calcium and magnesium solution is brought in contact with carbonate ions, mixed pre-nucleation clusters form. The equilibrium constants for their formation are reported revealing that over the entire range of possible cation mixing ratios, calcium gets enriched over magnesium in the pre-nucleation clusters. This can explain high magnesium contents in amorphous calcium carbonate. However, this enrichment alone is not sufficient to explain the magnesium content of less than 41 mol% which is found in magnesium calcite biominerals nucleated from seawater.

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540 Chemie
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Pre-nucleation cluster, amorphous calcium carbonate, preferential ion binding, Mg-Calcite, non classical nucleation
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ISO 690VERCH, Andreas, Markus ANTONIETTI, Helmut CÖLFEN, 2012. Mixed calcium-magnesium pre-nucleation clusters enrich calcium. In: Zeitschrift für Kristallographie - Crystalline Materials. 2012, 227(11), pp. 718-722. ISSN 2194-4946. Available under: doi: 10.1524/zkri.2012.1529
BibTex
@article{Verch2012Mixed-22633,
  year={2012},
  doi={10.1524/zkri.2012.1529},
  title={Mixed calcium-magnesium pre-nucleation clusters enrich calcium},
  number={11},
  volume={227},
  issn={2194-4946},
  journal={Zeitschrift für Kristallographie - Crystalline Materials},
  pages={718--722},
  author={Verch, Andreas and Antonietti, Markus and Cölfen, Helmut}
}
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