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

Gozalian, A ; Sharif University of Technology

2008 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.scient.2011.11.014
  3. Abstract:
  4. The aim of this study was to investigate the thermal behavior of Mg-doped calcium phosphate compounds. Nanocrystalline HA and β-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 Thermogravimetry 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 (β-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 β-TCP to α-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
  5. Keywords:
  6. B-tricalcium phosphate ; Hydroxyapatite ; Nanopowder ; Sol gel ; Thermal analysis ; Alkoxides ; Apatite structures ; Biphasic mixtures ; Ca/P ratio ; Characteristic peaks ; FT-IR spectrum ; Magnesium ions ; Mg content ; Mg-doped ; Morphological characteristic ; Nano powders ; Nanocrystallines ; Phosphate compounds ; Sol-gel methods ; Synthesized powder ; Thermal behaviors ; Transformation temperatures ; Tri-calcium phosphates ; Calcium ; Calcium phosphate ; Chemical analysis ; Differential thermal analysis ; Fourier transform infrared spectroscopy ; Gels ; Metal ions ; Nanostructured materials ; Scanning electron microscopy ; Sol-gels ; Sols ; Thermoanalysis ; Thermogravimetric analysis ; Transmission control protocol ; Transmission electron microscopy ; X ray diffraction ; X ray diffraction analysis ; Apatite ; Calcium ; Crystal structure ; Gel ; Magnesium ; Nanotechnology ; Phosphate (inorganic) ; Reaction kinetics ; Temperature profile ; Thermodynamic property ; Thermogravimetry ; Transformation ; X-ray diffraction
  7. Source: Scientia Iranica ; Volume 18, Issue 6 , 2011 , Pages 1614-1622 ; 10263098 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S1026309811002197