Hydrothermal preparation of nanocarbonated hydroxyapatite crystallites

Abstract

Needle-like nanocarbonated hydroxyapatite (CHA) powders were prepared by hydrothermal method using Ca(NO₃)₂, (NH₄)₃PO₄ and urea as reagents. Element analyse (EMA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and thermogravimetry differential thermogravimetry (TG-DTA) were used to characterise the crystalline phase, microstructure, chemical composition, morphology and thermal stability of CHA. The results show that AB type CHA can be obtained through this method. The carbonate content and the ratio of length to diameter of CHA can be adjusted by controlling the concentration of urea. The results show that CO₃²⁻incorporated into the apatite structure has an influence on the properties of CHA, such as the morphology and the size of crystal grain, the lattice parameters and the unit cell volume and the crystallisation degree and the stability.

Keywords

UREA CARBONATED HYDROXYAPATITE HYDROTHERMAL

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