Synthesis of Ultra-fine Hydroxyapatite Powders by Hydrothermal Reaction

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J. Korean Ceram. Soc. > Volume 29(12); 1992 > Article

Journal of the Korean Ceramic Society 1992;29(12): 997.

수열반응에 의한 Hydroxyapatite 초미분말의 제조

민경소, 최재웅, 최상흘

한양대학교 무기재료공학과

Synthesis of Ultra-fine Hydroxyapatite Powders by Hydrothermal Reaction

ABSTRACT

synthesized by the hydrothermal reaction of Ca(OH)2 suspension or Ca(NO3)2$.$4H2O solution with (NH4)2HPO4 solution, and the powders were characterized for each synthetic condition. Crystalline hydroxyapatite powders have average grain size of less than 50 nm. By increasing the reaction pressure, the crystallinity was improved, and the crystals were preferentially growing along c-axis. When Ca(NO3)2$.$4H2O of high solubility was used, hydroxyapatite of single phase was produced. However when Ca(OH)2 of low solubility was used more than 0.334 mol/ι, unreacted Ca(OH)2 remained. Diffraction spot patterns of transmission electron microscope show that powders synthesized by the hydrothermal reaction were composed of single crystals of hexagonal phase.