Rietveld Refinement of the Crystal Structure of Hydroxyapatite Using X-ray Powder Diffraction

A. El Yacoubi¹, A. Massit¹, S. El Moutaoikel¹, A. Rezzouk² and B. Chafik El Idrissi^1,

¹Team Materials Surfaces Interfaces, Laboratory Materials and Energitics, Fac of Sciences, University Ibn Tofail, kenitra, Morocco

²LPS, Fac. des Sciences Dhar El Mehraz, BP 1796, Atlas FES, Morocco

Cite this paper:
A. El Yacoubi, A. Massit, S. El Moutaoikel, A. Rezzouk and B. Chafik El Idrissi. Rietveld Refinement of the Crystal Structure of Hydroxyapatite Using X-ray Powder Diffraction. American Journal of Materials Science and Engineering. 2017; 5(1):1-5. doi: 10.12691/ajmse-5-1-1

Abstract

The stoichiometric hydroxyapatite, Ca₁₀(PO₄)₆(OH)₂ is prepared by an aqueous precipitation method at room temperature, the main reactants were Ca(OH)₂ and H₃PO₄ 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°).

Keywords:
hydroxyapatite infrared spectroscopy X-ray powder diffraction Rietveld refinement

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