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

Abstract

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°).

Creation of Bioceramic Coatings on the Surface of Ti–6Al–4V Alloy by Plasma Electrolytic Oxidation Followed by Gas Detonation Spraying

“…However, no calcium oxide (CaO) was usually present in other coatings of HA with thermal spraying [3,14,23]. This confirms good phase transplantation during the formation of the HA coating by the GDS method [52][53][54]. Based on the results obtained, the most homogeneous structure with lower poros and a large number of crystalline phases was obtained in the coating prepared in the el trolyte based on silicate (S).…”

“…However, no calcium oxide (CaO) was usually present in other coatings of HA with thermal spraying [3,14,23]. This confirms good phase transplantation during the formation of the HA coating by the GDS method [52][53][54]. 19 24…”

Bioperformance Studies of Biphasic Calcium Phosphate Scaffolds Extracted from Fish Bones Impregnated with Free Curcumin and Complexed with β-Cyclodextrin in Bone Regeneration

“…The Rietveld method was used to quantify the crystalline phases present in BCP using the FullProff program (Version 4. [41,42].…”

Sol-Gel Synthesis of Ceria-Zirconia-Based High-Entropy Oxides as High-Promotion Catalysts for the Synthesis of 1,2-Diketones from Aldehyde

“…Powder X-ray diffraction patterns were collected on a PANalytical Aeris Research Diffractometer in θ-θ geometry (Malvern PANalytical, Malvern, UK), using CuKα radiation (40 kV, 15 mA) at 298 K. The range of 2θ was from 20°-100°, with a step size of 0.02. Rietveld refinement was provided by the computer program FULLPROF [51]. The crystal structures of the synthesized compounds were visualized using the VESTA software [52].…”

“…TEM and -100 • , with a step size of 0.02. Rietveld refinement was provided by the computer program FULLPROF [51]. The crystal structures of the synthesized compounds were visualized using the VESTA software [52].…”