Structural and Vibrational Study of Hydroxyapatite Bio-ceramic Pigments with Chromophore Ions (Co2+, Ni2+, Cu2+, Mn2+)
Incorporating metal ions into a calcium hydroxyapatite structure is a successful pathway to increase their physical, chemical and biological properties. The calcium hydroxyapatite was obtained by solid state method at a high temperature, using CaCO3 and (NH4)2HPO4 as sources of calcium and phosphorus. Metal ion (Mn2+, Co2+, Ni2+, Cu2+) incorporation was carried out by dint of grinding and high temperature effect to remove all the impurity. The Hydroxyapatite powders that doped with metal ions were characterized by X-ray diffraction (XRD), and Fourier transforms infrared spectroscopy (FTIR) analysis to evaluate the structural and compositional changes. The only phase that is presented in pure hydroxyapatite sample was the hexagonal system. A Rietveld refinement has shown that doping with these ions affects the volume unit cell of HAP-M and it will be changed. We found that the samples doped HAP-M (M = Mn2+, Co2+, Ni2+, Cu2+) stabilizes only in the monoclinic phase.
KeywordsHydroxyapatite X-ray diffraction Rietveld refinement
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