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Effect of Heat Treatment on Grain Growth of Nanocrystalline Hydroxyapatite Powder

I. Mobasherpour, E. Salahi

Journal of Ceramic Science and Technology, Vol. 2, No. 2 (2011), pp. 119-124

DOI: 10.4416/JCST2010-00046

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Abstract

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.

Keywords

Hydroxyapatite, nanostructures, crystal growth, electron microscopy, X-ray diffraction

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