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Hydrothermal growth of hydroxyapatite single crystals under natural convection

Published online by Cambridge University Press:  31 January 2011

K. Teraoka ,
A. Ito ,
K. Onuma ,
T. Tateishi  and
S. Tsutsumi
K. Teraoka*
Affiliation:
National Industrial Research Institute of Nagoya (NIRIN), 1-1 Hirate, Kita, Nagoya, Japan
A. Ito
Affiliation:
National Institute for Advanced Interdisciplinary Research (MEL)
K. Onuma
Affiliation:
National Institute for Advanced Interdisciplinary Research (NIMC)
T. Tateishi
Affiliation:
National Institute for Advanced Interdisciplinary Research (MEL)
S. Tsutsumi
Affiliation:
Institute of Earth Science, School of Education, Waseda University
*
a)Address all correspondence to this author. e-mail: kteraoka@nnpost.nirin.go.jp
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Abstract

Whiskerlike-shaped hydroxyapatite single crystals with the calcium-deficient nature were hydrothermally grown under natural convection by using a temperature-gradient-applied pressure vessel. With this method, crystals grew thinner with a smaller tapering angle than those grown under the nonconvection. Maximum length of the crystals grown under natural convection was 8.3 nm. The grown crystals survived without fracture through at least ten times maximum indentation (25 µm) of the three-point bending tests, showing the maximum bending angle of 62°. Average tensile strength of the crystals was 410.0 MPa.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 6 , June 1999 , pp. 2655 - 2661
Copyright
Copyright © Materials Research Society 1999

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