Synthesis and thermal behavior of Mg-doped calcium phosphate nanopowders via the sol gel method

The aim of this study was to investigate the thermal behavior of mg-doped calcium phosphate compounds. nanocrystalline ha and beta-tcp mixtures containing different magnesium contents were synthesized via an alkoxide sol gel method. the ratio of (ca + mg)/p was kept constant at 1.67, and the mg content ranged between 0 and 3 mol%. the influence of magnesium on the phase composition, chemical structure, thermal behavior and morphological characteristics of nanopowders was analyzed using x-ray diffraction (xrd), fourier transform infrared spectroscopy (ft-ir), simultaneous thermogravime-try and differential thermal analysis (sta/dta), scanning electron microscopy (sem) and transmission electron microscopy (tem). based on the results of this research, the presence of magnesium led to the formation of mg-doped hydroxyapatite (mg-ha) and mg-doped tricalcium phosphate (beta-tcmp) phases. the characteristic peaks of apatite structures have been identified in the ftir spectra. it was found that both the presence of magnesium and low ca/p ratio caused the formation of a biphasic mixture, even at 470 °c. in addition, the beta-tcp to alpha-tcp transformation temperature increased due to the presence of magnesium ions. morphological investigations showed that the synthesized powders were composed of nanoparticles, with sizes ranging from 40 to 100 nm.