Abstract
Zinc-substituted hydroxyapatite (Zn-HA) powders were prepared by hydrothermal method using Ca(NO3)2, (NH4)3PO4 and Zn(NO3)2 as reagents. X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM) were used to characterize the crystalline phase, microstructure, chemical composition, morphology and thermal stability of Zn-HA. The results show that the substitution content of zinc (Zn) in Zn-HA powders prepared in NaOH solution is higher than that prepared in NH3 solution, and is lower than that of the corresponding amount of starting materials. The substitution of the Zn ion for calcium ion causes a lower crystallinity of Zn-HA and changes the lattice parameters of Zn-HA, since the ionic radius is smaller in Zn2+ (0.074 nm) than in Ca2+ (0.099 nm). Furthermore, the substitution of the Zn ions restrains the growth of Zn-HA crystal and decreases the thermal stability of Zn-HA. Zn-HA powder prepared in NH3 solution starts to decompose at 800 °C when the Zn fraction increases to 15 mol%, while that prepared in NaOH solution start to decompose at 5 mol% Zn. The substitution content of Zn significantly influences the thermal stability, microstructure and morphology of Zn-HA.
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The authors would like to thank National Nature Science Foundation of China (30600149), the science research foundation of ministry of Health & United Fujian Provincial Health and Education Project for Tackling the Key Research, P.R. China (WKJ 2005-2-008), Fujian Development and Reform Commission of China (No. 2004[477]) and Undergraduate extracurricular project of Fujian Normal University (BKL2006-021).
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Li, M., Xiao, X., Liu, R. et al. Structural characterization of zinc-substituted hydroxyapatite prepared by hydrothermal method. J Mater Sci: Mater Med 19, 797–803 (2008). https://doi.org/10.1007/s10856-007-3213-4
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DOI: https://doi.org/10.1007/s10856-007-3213-4