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Metastable Intermediate Phase during Phase Transformation of Calcium Phosphates
Kazuo Onuma1* and Yuki Sugiura21National Institute of Advanced Industrial Science & Technology, Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566 Japan
2Department of Biomaterial, Faculty of Dental Science, Kyushu University, 3-1-1, Maidashi, Higashi, Fukuoka 812-0054 Japan
- Corresponding Author:
- Kazuo Onuma
National Institute of Advanced Industrial Science & Technology
Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566 Japan
Tel: +81-29-861-4832
E-mail: k.onuma@aist.go.jp
Received date: October 14, 2015; Accepted date: December 14, 2015; Published date: December 21, 2015
Citation: Onuma K, Sugiura Y (2015) Metastable Intermediate Phase during Phase Transformation of Calcium Phosphates. J Biotechnol Biomater 5:214. doi:10.4172/2155-952X.1000214
Copyright: © 2015 Onuma K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Abstract
Phase transformation of calcium phosphates from amorphous to crystalline phases around neutral pH proceeds via direct structure conversion using non-ionic elementary units. This transformation inevitably forms metastable intermediate-structured phase(s) between the two end phases. In addition to conventional calcium phosphate phases appearing in the transformation, new unknown phases were observed. They did not correspond to simply poor crystalline materials of conventional phases and instead had particular structures. One was pseudo-OCP, which lacked the HPO4-OH layers in the conventional OCP structure.
