Abstract
Equilibrium in the quaternary CaO–P2O5–H2CO3–H2O system at 298 K in air was studied in a region of low concentrations of liquid-phase components. We revealed a dependence of the composition of resultant equilibrium solid phases on the Ca/P ratio of the initial components and on pH of the equilibrium liquid phase. It was found that the entire region of the system having low concentrations of liquid-phase components is occupied by variable-composition compounds with apatite structure. Two types of carbonate-containing apatite compounds were detected. The first type of apatite forms at 5.4 ≤ pH ≤ 7.0, contains HPO42− groups in the lattice, and has an invariant point with brushite \({\text{CaHPO}}_{{4}} \cdot {\text{2H}}_{{2}} {\text{O}}\) at pH ≈ 5.4. The second type arises at pH > 7.0, does not contain an acidic group, and has an invariant point with CaCO3 at pH ≥ 8.
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This research was carried out within a state assignment to the Institute of Solid State Chemistry and Mechanochemistry SB RAS (Project No. 121032500064-8).
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Chaikina, M.V., Bulina, N.V., Prosanov, I.Y. et al. Formation of carbonated apatite in equilibrium system CaO–P2O5–H2CO3–H2O at 298 K in air. Chem. Pap. 77, 5763–5771 (2023). https://doi.org/10.1007/s11696-023-02895-0
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DOI: https://doi.org/10.1007/s11696-023-02895-0