The characteristics of synthetic hydroxyapatite sintered at high temperature were studied by means of X-ray diffraction, infrared and differential thermal analysis, and thermogravimetric analysis. The results show that synthetic HAp with a Ca/P ratio near 1.67 is stable when sintered in dry or wet air below 1200°C. Even after long times, no tricalcium phosphate (TCP) can be observed. Beyond 1200°C, HAp loses its OH groups gradually and is transformed to oxyapatite [Ca10O(PO4)6 or Ca(PO4)6O.□]. At 1450°C oxyapatite dissociates into the products α-Ca3(PO4)2, Ca2P2O7 and Ca4P2O9.
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References
K.DE GROOT (ed.), “Bioceramics of calcium phosphate”, (CRC Press Inc., Boca Raton, FL, 1983).
K. KAMIYA, T. YOKO, K. TANAKA and Y. FUJIYAMA, J. Mater. Sci. 24 (1989) 827.
J. WU and T. YEH, J. Mater. Sci. 23 (1988) 3771.
X. ZHANG, J. CHEN, J. ZHOU, J. FENG and C. LI, Clin. Mater. 4 (1989) 317.
F. C. M. DRIESSENS, in “Bioceramics of calcium phosphate”, edited by K.de Groot, (CRC Press Inc., Boca Raton, FL, 1983).
J. ARENDS, J. CHRISTOFFERSEN, J. Cryst. Growth 84 (1987) 515.
A. KRAJEWSKI, A. RAVAGLIOLI Biomaterials 5 (1984) 105.
P. DUCHEYNE and G. W. HASTINGS, “Metal and ceramic biomaterials”, Vol. II (CRC Press Inc., Boca Raton, FL, 1984).
J. C. HEUGHEBAERT and G. BONEL, “Biological and biochemical performance of biomaterials”, edited by P. Christel et al., (Elsevier, Amsterdam, 1986).
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Zhou, J., Zhang, X., Chen, J. et al. High temperature characteristics of synthetic hydroxyapatite. J Mater Sci: Mater Med 4, 83–85 (1993). https://doi.org/10.1007/BF00122983
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DOI: https://doi.org/10.1007/BF00122983