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Transmission electron microscopic studies on an initial stage in the conversion process from α-tricalcium phosphate to hydroxyapatite

Published online by Cambridge University Press:  31 January 2011

Masato Tamai ,
Toshiyuki Isshiki ,
Koji Nishio ,
Mitsuhiro Nakamura ,
Atsushi Nakahira  and
Hisamitsu Endoh
Masato Tamai
Affiliation:
Graduate School of Science and Technology, Kyoto Institute of Technology, Gosho-kaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
Toshiyuki Isshiki
Affiliation:
Department of Electronics and Information Science, Kyoto Institute of Technology, Gosho-kaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
Koji Nishio
Affiliation:
Department of Electronics and Information Science, Kyoto Institute of Technology, Gosho-kaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
Mitsuhiro Nakamura
Affiliation:
Graduate School of Science and Technology, Kyoto Institute of Technology, Gosho-kaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
Atsushi Nakahira
Affiliation:
Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Gosho-kaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
Hisamitsu Endoh
Affiliation:
Department of Electronics and Information Science, Kyoto Institute of Technology, Gosho-kaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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Abstract

The microstructural changes in the initial stage of a conversion process of α-tricalcium phosphate [α-Ca3(PO4)2] (α-TCP) to hydroxyapatite [Ca10(PO4)6(OH)2] (HAp) by the hydrolysis method were investigated by transmission electron microscopy (TEM). To investigate the microstructural changes that take place during the conversion process, we prepared two types of α-TCP specimens for TEM: α-TCP powder and sintered α-TCP thin film. According to our results, the microstructural changes can be summarized as follows. At first, the surface of the α-TCP was covered with an amorphous calcium phosphate layer, resulting from hydration or the dissolution of α-TCP. Subsequently, the nucleation of HAp occurred on the amorphous layer, and then dendritic structures appeared on the layer. Thereafter, the dendritic structures would grow into needlelike fine HAp crystals.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 11 , November 2003 , pp. 2633 - 2638
Copyright
Copyright © Materials Research Society 2003

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