Abstract
Microwave synthesis of nanocrystalline Zn/Mg substituted and Zn/Mg-F co-substituted hydroxyapatites is reported in this study. Substitution of Zn/Mg is expected to increase the bioactivity, whereas the fluorine substitution is aimed for the attainment of chemical and thermal stability of the hydroxyapatite. The thermal stability of the nanopowders was studied by annealing the samples at 900 °C for 2 h. The phase composition and crystallite size of the nanopowders were analyzed by the X-ray diffraction (XRD). Fourier transform infrared (FTIR) spectroscopic study was performed to analyze the various functional groups present in the samples. Scanning transmission electron microscopy (STEM) analysis was performed to study the morphology and size of the as-synthesized nanopowders. The XRD analysis of the as-synthesized nanopowders depicts the formation of single-phase hydroxyapatite (HA). Annealing of the as-synthesized Zn/Mg substituted hydroxyapatite resulted in the thermal decomposition of the HA, thereby forming β-Tri calcium phosphate (β-TCP). The amount of β-TCP phase is observed to be decreased by the fluorine co-substitution along with the Zn/Mg, thereby indicating the improved thermal stability.
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