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A simple method, chemical precipitation at low temperature from Ca(NO3)2·4H2O and (NH4)2HPO4 to tailor single phase, highly crystalline nanocrystal hydroxyapatite (HAp) powders was introduced in this paper. HAp powders with controlled morphologies (spherical and rod-like) and different grain sizes have been obtained by varying the reaction temperature, reaction mode, and heat treatment accordingly...
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