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Home  >  Journal list  >  Journal of the Ceramic Society of Japan ( 2003 - 2007 )  >  Vol.113  No.1314 (February) (2005)  >  pp.131-134

Journal of the Ceramic Society of Japan ( 2003 - 2007 )
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Transmission Electron Microscopic Study on the Migration of Ca Ions in Ca-Deficient Hydroxyapatite during Thermal Decomposition

Masato TAMAI1), Kiyoko SAKAMOTO2), Shunro YAMAGUCHI3) and Atsushi NAKAHIRA1)
1) Kyoto Institute of Technology
2) Osaka Sangyo University
3) ISIR, Osaka Uniersity


  The migration of Ca ions during thermal decomposition of Ca-deficient hydroxyapatite (Ca-def HAp) involving the formation of β-TCP was discussed in the present paper. The migration of Ca ions at high temperature was examined by studying the thermal behavior of Sr ions in Sr-substituted Ca-def HAp using transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (TEM-EDX). Substitutions of Ca ions in Ca-def HAp by Sr ion were carried out by hydrothermal treatment in Sr(NO3)2 solution. The composition of samples obtained by hydrothermal treatment was identified as Ca9.27Sr0.27(HPO4)0.46(PO4)5.54(OH)1.54. In addition, it was considered that Sr ions would be in Ca(II) site in Sr-substituted Ca-def HAp lattice. Since the thermal behavior of Sr-substituted Ca-def HAp was almost the same as that of Ca-def HAp, the migration of Sr ions in Sr-substituted Ca-def HAp during thermal decomposition could be regarded as the same as that of Ca(II) ions in Ca-def HAp. By TEM and TEM-EDS analysis, it was revealed that Sr ions were detected only in β-TCP phase after thermal decomposition. Therefore, these results suggested that β-TCP phase would be formed by the priority migration of Ca(II) ions in Ca-def HAp.



Keyword:
Ca-deficient hydroxyapatite, Thermal decomposition, Migration, Transmission electron microscopy, Strontium ion, Substitution, Hydrothermal treatment

Received: July 23, 2004
Accepted: October 26, 2004 , Published online: February 01, 2005
Copyright (c) 2005 The Ceramic Society of Japan

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