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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.120  No.1400 (April) (2012)  >  pp.131-137

Journal of the Ceramic Society of Japan
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Comparative study of hydroxyapatite formation from α- and β-tricalcium phosphates under hydrothermal conditions

Tomoyo GOTO1), Ill Yong KIM1), Koichi KIKUTA1) and Chikara OHTSUKI1)
1) Graduate School of Engineering, Nagoya University

  We investigated the crystal growth of hydroxyapatite (HAp) from α-phase (α-TCP) and β-phase (β-TCP) tricalcium phosphates showing different solubility, under hydrothermal conditions. Samples of α-TCP and β-TCP were treated up to 72 h under hydrothermal conditions at 120°C. The α-TCP sample was completely transformed into HAp crystals within 1 h after the powder was exposed to hydrothermal conditions. In contrast, the β-TCP sample required more than 72 h to achieve complete transformation into HAp crystals. This difference in transformation behavior affected the morphology of the formed HAp crystals, which were observed to form plate- and rod-shaped crystals from α- and β-TCP, respectively. The high dissolution rate of α-TCP led to fine, plate-shaped crystals whose morphology was maintained up to 72 h once they formed. In comparison, the low dissolution rate of β-TCP allowed production of large, well-crystallized HAp crystals through the hydrothermal treatment conditions, even though the chemical composition of the reactant samples were the same. The morphology of the HAp crystals formed as a result of the hydrothermal conditions was controlled by selecting starting materials whose solubility affects an increase in the degree of supersaturation in the solution.

Hydrothermal processing, Hydroxyapatite, Tricalcium phosphate, Solubility, Ionic product

Received: December 07, 2011
Accepted: February 03, 2012 , Published online: March 28, 2012
Copyright (c) 2012 The Ceramic Society of Japan



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