Synthesis of Na+,CO32--containing calcium phosphate nanoparticles and their thermal transformations

The nanoparticles of Na ⁺,CO ₃ ^2--containing hydroxyapatites have been prepared from aqueous solutions for system Na ⁺-Ca ²⁺-NO ₃ ^--CO ₃ ^2--PO ₄ ^3- at molar ratio of Ca/P = 1.67:1 and CO ₃ ^2-/PO ₄ ^3- = 0, 1.0, 2.0, 3.0. Thermal transformations of the obtained phosphates have been established for the temperature range of 80-900 °C. The obtained complex-substituted HAP have been investigated using IR spectroscopy, scanning electron microscopy, X-ray diffraction and thermogravimetry.