Abstract
High purity hydroxyapatite was synthesized with ammonium hydroxide and ethylenediaminetetraacetic acid (EDTA) through a hydrothermal synthesis process, using calcium hydroxide and phosphoric acid as the precursors for calcium and phosphorus. The newly synthesized hydroxyapatite was characterized by the techniques of X‐ray diffraction (XRD), scanning electron microscopy (SEM), Fourier‐transform infra‐red spectroscopy (FTIR), thermal analysis system (TG/DTA), electron probe micro analyzer (EPMA), and energy dispersive X‐ray (EDX) spectrometer. The results achieved from the above analyses demonstrated that pure crystalline hydroxyapatite can successfully be produced by using ammonium hydroxide and EDTA through the hydrothermal method. SEM revealed that the hydroxyapatite particles consisted of crystallized dandelion‐like structures with an average size of about approximately 10 µm. The Ca/P molar ratio of synthesized hydroxyapatite was determined as 1.66, which is almost close to the stoichiometric ratio (1.67) that is expected for a pure hydroxyapatite phase. TG/DTA indicated that there was almost no weight loss by the temperature change and confirmed that it was an ultra pure substance. XRD and FTIR results indicated that hydroxyapatite could be decomposed into tricalcium phosphate as the calcinations temperature increased to 900 °C.
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