The aim of this work is to study the effect of magnesium on the physic-chemical properties of hydroxyapatite prepared by sol-gel route. Magnesium Nitrate Hexahydrate, Calcium Nitrate tetrahydrate, and triethyl phosphate (TEP) were used as precursors for Mg, Ca, and P, respectively. Noted that the molar ratio (Ca +Mg)/P was kept constant at 1.67 when the magnesium was added (0 to 10 % (mol)) to the prepared solutions. Based on the our previous results, all solutions were aged at 70°C for 24 h, the distilled water was used as medium solvent. The same conditions were used for gelling and drying of the aged solutions. All dried gels were calcined at 700°C for 1 h and heat treated at 1100, 1200 and 1300°C for 4 h in order to study the effect of magnesium on the crystallization of doped hydroxyapatite (Ca10-xMgx (PO4)6(OH)2, crystal lattice parameters, thermal stability and morphological of hydroxyapatite. The XRD and FTIR results showed that the hydroxyapatite is the major formed phase at all temperatures without any decomposition to the tricalcium phosphate. The CaO was present as secondary phase at 700°C. But the intensity of this phase decreased with temperature. Also, a minor ratio of MgO was present in samples doped by 5% and 10% MgO. The lattice parameters of doped hydroxyapatite decreased in comparison to pure hydroxyapatite because the ion radius of magnesium is lower than that of calcium. The results of analysis of distribution size confirmed the formation of agglomerates as results of the assemblage of small grains as confirmed by SEM images. The obtained results confirmed the incorporation of the magnesium in the lattice structure of HA.
Citation
Fatima Zohra MEZAHI ,
malika MERZOUGUI ,
,(2022), Caracterisation of doped hydroxyapatite by magnesium versus the heat treatment temperature,2nd International Seminar on Industrial Engineering and Applied Mathematics (ISIEAM’22),Skikda , Algérie
