Effect of Heat Treatment on Grain Growth of Nanocrystalline Hydroxyapatite Powder
I. Mobasherpour, E. Salahi
Materials and Energy Research Center, Ceramics Department, P.O. Box 31787-316, Karaj, Iran
received December 8, 2010, received in revised form February 23, 2011, accepted March 4, 2011
Vol.2, No.2, Pages 119-124 DOI: 10.4416/JCST2010-00046
Nanocrystalline hydroxyapatite powder was synthesized with the solution-precipitation method followed by heat treatment in order to evolve phases, which were studied with XRD and TEM techniques. The crystallites sizes were estimated with the Scherrer method and results confirmed with TEM micrographs. The experimental observations showed that nanocrystalline hydroxyapatite can be successfully prepared from raw materials with the precipitation technique. Compared to other techniques, the precipitation technique is a competitive method for nanocrystalline hydroxyapatite synthesis. Moreover, a growth kinetic investigation was performed on the nanocrystalline growth process during heat treatment. Results have shown that grain sizes increase exponentially with temperature and the growth rate constants increase with time. The average activation energy of hydroxyapatite grain growth obtained 30.33 – 77.78 KJ/mol with this method.
Hydroxyapatite, nanostructures, crystal growth, electron microscopy, X-ray diffraction
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This work was supported by the Materials and Energy Research Center. The authors would also like to thank Dr. B. Jadedeyan for her help in improving the English of this paper.