Abstract: | The interaction in the CaCl2-MgCl2-(NH4)2HPO4-NH3-H2O and CaCl2-MgCl2-(NH4)2HPO4-(C6H11NO4)
n
-NH3-H2O systems at 25°C has been investigated by the solubility (Tananaev’s residual concentration) method and by pH measurements.
Magnesium-containing calcium hydroxylapatites with the general formula Mg
x
Ca10 − x
(PO4)6(OH)2 · nH2O (x = 0.05, 0.1, 0.2, 0.3; n = 6–7.3) and magnesium- and chitosan-containing calcium hydroxylapatites with the general formula Mg
x
Ca10 − x
(PO4)6(OH)2 · y(C6H11NO4) · nH2O (x = 0.05, 0.1, 0.2, 0.3; y = 0.1, 0.3, 0.46; n = 6–8.3) have been isolated in the nanocrystalline state. The solids have been characterized by chemical and thermogravimetric
analyses, X-ray diffraction, and IR spectroscopy. |