Transmission Electron Microscopic Study on Thermal Decomposition Process of Calcium-Deficient Hydroxyapatite


Article Preview

In our previous study, we reported that a metastable phase with high Ca/P molar ratio appeared in the temperature range from 700 οC to 800οC The purpose of this study is to investigate the crystallographic relationship between the metastable phase and HAp matrix. Ca-def HAp was annealed at 500-1000' ο C in air. High-resolution transmission electron microscopic (HRTEM) observations were performed along the [010], [110] and [001] zone axes in order to investigate the structure of the metastable phase. From HRTEM images and results of the analysis of selected area electron diffraction patterns along [010], [110] and [001] zone axes, the lattice constants of the metastable phase were analyzed into a=2.86nm, b=0.94nm, and c=0.69nm of an orthorhombic crystals system.



Key Engineering Materials (Volumes 317-318)

Edited by:

T. Ohji, T. Sekino and K. Niihara




M. Tamai et al., "Transmission Electron Microscopic Study on Thermal Decomposition Process of Calcium-Deficient Hydroxyapatite", Key Engineering Materials, Vols. 317-318, pp. 785-788, 2006

Online since:

August 2006




[1] A.S. Posner: Physiol. Rev. 49 (1969), P. 760.

[2] H. Monma, S. Ueno, Y. Tsutsumi and K. Kanazawa: J. Ceram. Soc. Jpn. (Yogyo-Kyokai-shi) 86 (1978), P. 590.

[3] I. R. Gibson, I. Rehaman, S. M. Best and W. Bonifild: J. Mater. Sci. in Med. 12 (2000), P. 799.

[4] L.L. Hench: J. Am. Ceram. Soc. 74 (1991), P. 1487.

[5] A. Nakahira, M. Tamai, K. Sakamoto and S. Yamaguchi: J. Ceram. Soc. Jpn. 108 (2000), P. 99.

[6] M. Tamai, S. Miki, G. Pezzotti and A. Nakahira: J. Ceram. Soc. Jpn. 108 (2000), P. 915.

[7] M. Tamai, M. Nakamura, T. Isshiki, K. Nishio, H. Endoh and A. Nakahira: J. Mater. Sci: Mater in Med 14 (2003), P. 617.

[8] A. Nakahira, K. Sakamoto, S. Yamaguchi, M. Kaneno, S. Takeda and M. Okazaki: J. Am. Ceram. Soc., 82 (1999), P. 2029. Fig. 4. Crystallographic relationship between HAp matrix and a metastable phase (MSP) from analysis of SAED results.

Fetching data from Crossref.
This may take some time to load.