The stoichiometric hydroxyapatite, Ca 10 (PO 4 ) 6 (OH) 2 is prepared by an aqueous precipitation method at room temperature, the main reactants were Ca(OH) 2 and H 3 PO 4 without addition of ammonia solution. The sample was analyzed by Fourier transformed infrared spectroscopy (FTIR) which reveals the presence of a small amount of carbonate due to absorbance of carbon dioxide from the air during synthesis process. The crystal structure was carried out by X-ray powder diffraction data and the Rietveld method using FullPROF software. We confirmed that this material has a hexagonal structure (space group P63/m; Z = 1). Unit-cell parameters with higher precision (a = b = 9.4159(4) Å , c = 6.8819(3) Å, α = β = 90°; and γ = 120°).
In this paper, the synthesis of nanosized powders β -Tricalcium phosphate β -Ca3(PO4)2 was studied by the wet chemical method at different values of reaction temperature, initial concentration of diammonium hydrogen phosphate (NH4)2HPO4, calcium nitrate tetrahydrate Ca(NO3)2·4H2O addition rate, pH of reaction and aging time. All these parameters have a great impact on the properties of the resulting β-TCP nano powders. Analysis results of morphology, structure of TCP powder from infrared (IR) spectra, X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicated that the synthesized TCP powder had spherical crystal shape with crystallite size, calculated by XRD method, less than 60 nm, mono and biphasic structure composed of βTCP with pyrophosphate calcium or hydroxyapatite. The variation of the synthesis conditions did not affect the morphology, but it affect the size of crystallites and particles.
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