Journal of Metals, Materials and Minerals

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Morphology controlled calcium orthophosphates under hydrothermal reaction was achieved using saturated solution of monocalcium phosphate monohydrate (MCPM) as a starting material. MCPM saturated solution was hydrothermally treated at 180°C for 4 and 12 hrs. Citric acid as a chelating agent and a mixed solution of NaNO3 and NaF were individually added into the reactor. The morphologies, phases and microstructures of the obtained products were characterized by optical microscope (OM), X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. Irregular shape crystals were obtained when a saturated solution of MCPM was autoclaved at 180°C for 4 hrs. Though citric acid was added into the reaction, the irregular shape products were still obtained with a minority of hexagonal plate crystals. As a result, the whiskers were synthesized when the mixed solution of NaNO3 + NaF was added into MCPM saturated solution and treated at 180°C for 12 hrs. Although the reaction time decreased from 12 to 4 hrs, the whisker products were still obtained. Phase analyses clarified by XRD that the whiskers were hydroxyapatite.

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