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Nanophase calcium-deficient hydroxyapatite(CDHA) with a Ca/P ratio about 1.5 synthesized by chemical wet method was sintered at different temperatures, and then its chemical composition, phase structure and morphology were analyzed with methods of FT-IR spectroscopy, X-ray diffraction (XRD) and field emission scanning microscopy (FESEM), respectively. Results show that when the sintering temperature is below 500 ℃, apatite crystal keeps a stable size with a diameter of 12-26 nm and a length of 30-66 nm. After being sintered at 600 ℃ for 2 h, apatite crystal grows much larger with a diameter of 25-40 nm and a length of 75-100 nm. At the temperature of 700-800 ℃, this powder decomposes into Ca_3(PO_4)_2. The crystal size of the Ca_3(PO_4)_2 surpasses 200 nm in diameter and length. NH+_4 ion can be removed at temperature beyond 300 ℃.
Nanophase calcium-deficient hydroxyapatite (CDHA) with a Ca / P ratio of about 1.5 synthesized by chemical wet method was sintered at different temperatures, and then its chemical composition, phase structure and morphology were analyzed with methods of FT-IR spectroscopy, X-ray diffraction (XRD) and field emission scanning microscopy (FESEM), respectively. Results show that when the sintering temperature is below 500 ° C, apatite crystals keeps a stable size with a diameter of 12-26 nm and a length of 30-66 nm. After the sintering at 600 ° C for 2 h, apatite crystal grows much larger with a diameter of 25-40 nm and a length of 75-100 nm. At the temperature of 700-800 ° C, this powder decomposes into Ca_3 (PO_4) _2 . The crystal size of the Ca_3 (PO_4) _2 surpasses 200 nm in diameter and length. NH + _4 ion can be removed at temperature beyond 300 ° C.