Hydroxyapatite powder doped with aluminium (AI-HAp) was synthesized from Ca(NO3)2 Al(NO3)3 and (NH4)2HPO4 by chemical precipitation method that has formula Ca10-xAlx(PO4MOH)2 with x = 0.5
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8. The analysis results by X-ray Diffraction (XRD), Energy Dispersive X-ray analysis (EDX) and Scanning Electron Microscopy (SEM) show that Ca/Al ratio in solution varies 9.5/0.5
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6/4, aluminium mass in AI-HAp powder was from 1.23 percent to 9.91 percent. AI-HAp powder had crystal structure and single phase similar as HAp and diameter about 20 nm. With Ca/AI ratio in solution 5/5
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2/8, AI-HAp has AI(OH)3 phase (Ca/AI ratio 5/5), especial with Al content was too high, AI-HAp powder is not obtained, instead of amorphous AI(OH)3 powder.