PMID: 15348424Sep 7, 2004Paper

A metastable phase in thermal decomposition of Ca-deficient hydroxyapatite

Journal of Materials Science. Materials in Medicine
Masato TamaiAtsushi Nakahira

Abstract

We investigated the microstructural changes on an atomic length scale during thermal decomposition process of Ca-deficient hydroxyapatite (Ca-def HAp) by high-resolution transmission electron microscopy (HRTEM). Ca-def HAp was prepared by hydrolysis of alpha-tricalcium phosphate. The Ca-def HAp had a whisker-like morphology 2-5 microm in length and 0.1 microm in diameter that was elongated along c-axis. Thicker planer defects parallel to the (100) plane of the HAp matrix were observed as precipitation in the sample annealed at 700 and 800 degrees C by HRTEM observation. Thickness of the precipitation was about 10 nm and the boundaries between the precipitation and HAp matrix was coincident. The periodicity in the precipitation was parallel to the (100) plane of the HAp matrix and measured to be 1.42 nm. Since the precipitation was observed only in the sample annealed at a narrow temperature range of 700-800 degrees C, it was regarded as a metastable phase formed on the thermal decomposition process. Absorption peaks in IR spectra of annealed Ca-def HAp containing the metastable phase appeared at 744 and 3538 cm(-1) due to non-stoichiometric HAp with high Ca/P molar ratio. Furthermore, the results of energy dispersive X-ray spec...Continue Reading

Citations

Jan 4, 2006·Journal of Materials Science. Materials in Medicine·L HerschkeG Wegner
Mar 24, 2007·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Masato TamaiToshie Tsuchiya
Jul 11, 2007·Journal of Materials Science. Materials in Medicine·Ion TeoreanuAlina Melinescu
May 25, 2006·Journal of Biomedical Materials Research. Part a·Sahil JalotaA Cuneyt Tas

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