Low-Temperature Formation and Identification of Biphasic Calcium Carbonate Phosphates

Biphasic calcium carbonate phosphates comprised of amorphous calcium carbonate phosphate and carbonated hydroxyapatite were synthesized by wet precipitation at pH 9, Ca/P = 1.67, and concentrations of 0.60–0.90 mol/L under varying precipitation conditions. The wet formation of biphasic calcium carbo...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2022-11, Vol.67 (11), p.1718-1730
Main Authors: Glazov, I. E., Krut’ko, V. K., Musskaya, O. N., Kulak, A. I.
Format: Article
Language:English
Subjects:
Amorphization
Apatite
Calcite
Calcium carbonate
Calcium ions
Carbonation
Chemistry
Chemistry and Materials Science
Crystallization
Decantation
Hydroxyapatite
Inorganic Chemistry
Leaching
Low temperature
Phosphates
Synthesis and Properties of Inorganic Compounds
Thermal stability
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Summary:Biphasic calcium carbonate phosphates comprised of amorphous calcium carbonate phosphate and carbonated hydroxyapatite were synthesized by wet precipitation at pH 9, Ca/P = 1.67, and concentrations of 0.60–0.90 mol/L under varying precipitation conditions. The wet formation of biphasic calcium carbonate phosphates includes a partial conversion of the amorphous phase into a mixture of carbonated hydroxyapatite and calcite, followed by leaching of calcite and constitutional Ca 2+ and ions during long-term decantation. The identification of biphasic calcium carbonate phosphates involves complex analysis using a spectroscopic method to elucidate carbonate substitution schemes, an X-ray diffraction method to determine the degree of apatite amorphization, and thermoanalytical methods to detect the effects of crystallization of the amorphous phase. Variations in the preparation parameters provide a means for controlling the contents of both amorphous calcium carbonate phosphate and constitutional ions in biphasic calcium carbonate phosphates, which amounts determine their resorbability and thermal stability.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023622601313