Abstract
Nanocrystalline hydroxyapatites were prepared by the precipitation method using a water soluble Ca 2+ organic compounds and (NH 4) 2HPO 4. The fine nanohydroxyapatites had spherical, needle-like or mixed morphology and specific areas around 150 m 2/g. The nanocrystalline powders differed by thermal stability and they were transformed to bi- or three-phasic systems with hydroxyapatite, βTCP and αTCP phases after annealing at 1000 °C.
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