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À propos de : Silicon Incorporation in Hydroxylapatite Obtained byControlled Crystallization        

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  • Silicon Incorporation in Hydroxylapatite Obtained byControlled Crystallization
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  • Silicon-containing hydroxylapatites have been prepared by an aqueous precipitationmethod, partially substituting phosphate with silicate groups. The as-prepared productscontain two phases: an amorphous phase and an apatite phase. At this first stage, thephosphate deficiency is not primarily compensated by silicate incorporation, but by carbonatescontained in the aqueous media. The silicon plays a very important role at the microstructurallevel, taking part in increasing the amount of the amorphous phase, as well as leading tosmaller crystallite size. After removing the carbonates by treating the samples at 900 °C,the Si seems to get into the apatite structure. This incorporation also leads to structuralchanges and higher tetrahedral distortion compared to that of pure hydroxylapatite, whichcan explain the higher reactivity of these compounds previously reported by other authors.
  • Silicon-containing hydroxylapatites have been prepared by an aqueous precipitation method. The as-prepared products are constituted by an amorphous phase and an apatite phase. The silicon seems to play a very important role at the microstructural level, taking part in increasing the amount of amorphous phase, as well as leading to smaller crystallite size. After treating the samples at 900 °C, the Si seems to get into the apatite structure.
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