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Amorphous calcium phosphate (ACP), which generally forms as an unstable precursor during the initial stage of hydroxyapatite (HAp) synthesis, was synthesized by rapid dropwise addition of aqueous ammonia into calcium dihydrogenphosphate monohydrate (MCP) solution. ACP was crystallized easily to various calcium phosphates such as dicalcium phosphate dihydrate (DCPD), octacalcium phosphate (OCP) and HAp by dipping ACP (Ca/P atomic ratio 1.25-1.55) in various solutions. The present work wasdoi:10.2109/jcersj.105.976 fatcat:r2idmyjljveqdjkh3rurvnxtve