Influence of Phosphate Ions on the Stability of Amorphous Calcium Carbonate
Amorphous calcium carbonate (ACC) occurs with varying stabilities in different organisms. It is thought that the stability is influenced by certain ions and proteins. We describe here a study investigating the particular influence of phosphate ions on the stability of ACC. Synthesised ACC was treated with different concentrations of Na2HPO4 and molar ratios of PO4:Ca ≥ 12:1 were shown to be effective in preventing crystallisation of ACC to calcite. The nature of the resulting sample is discussed.
Takashi Nakamura, Kimihiro Yamashita and Masashi Neo
S. Akhtar et al., "Influence of Phosphate Ions on the Stability of Amorphous Calcium Carbonate ", Key Engineering Materials, Vols. 309-311, pp. 179-182, 2006