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Influence of thermal treatment on the dissolution of hydroxyapatite powders in simulated body fluid  

Song, Dae-Sung (Department of Advanced Materials Engineering, Chosun University)
Seo, Dong-Seok (School of Materials Science Engineering, Seoul National University)
Lee, Jong-Kook (Department of Advanced Materials Engineering, Chosun University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.15, no.2, 2005 , pp. 79-85 More about this Journal
Abstract
Commercial hydroxyapatite (HA) powders were calcined at the temperature range of $1000{\sim}1350^{\circ}C$ in air, for 2h, and the calcined powders were immersed in simulated body fluid (SBF) of pH 7.4 at $37^{\circ}C$ for 3 or 7 days. Thermal decomposition and their related dissolution behaviors of hydroxyapatite were investigated by XRD, FT-IR, and TEM. At the temperature of $1200^{\circ}C$, HA gradually releases its $OH^-$ ions and transforms to OHAP((oxyhydroxyapatite, ($Ca_{10}(PO_4)_6O_x(OH)_{2-2x}$)). HA thermally decomposes to ${\alpha}-TCP$ (${\alpha}-tricalcium$ phosphate) and TTCP (tetracalcium phosphate) phase at $1350^{\circ}C$. It was found that the surface dissolution of the hydroxyapatite powders was accelerated by non-stoichiometric composition and decomposed to ${\alpha}-TCP$ and TTCP.
Keywords
Hydorxyapatite; ${\alpha}$-Tricalcium phosphate; Tetracalcium phosphate; Thermal decomposition; Dissolution; Simulated body fluid;
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