Abstract
Silicon-substituted hydroxylapatite nanopowders containing 0.14–1.4 wt % Si have been synthesized by the heterophase reaction between calcium hydroxide, diammonium hydrogen phosphate, tetraethoxysilane, and water and by precipitation from aqueous solutions of calcium nitrate, diammonium hydrogen phosphate, and tetraethoxysilane. The products have been characterized by specific surface area (S BET) measurements, X-ray powder diffraction, chemical analysis, and IR spectroscopy. The phase composition of the products depends on the synthesis method. The heterophase reaction yields nanopowders with S BET = 20–24 m2/g in which the main crystalline phase is silicon-substituted hydroxylapatite. The product synthesized by precipitation from solution has an S BET of up to 73 m2/g and an increased tricalcium phosphate content, which crystallizes from the amorphous phase during heat treatment.
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