PREPARATION AND CHARACTERIZATION OF HYDROXYAPATITE BY A REACTION OF CALCIUM TUNGSTATE WITH PHOSPHATE

M. Kawakami; S. Shimamura; Y. Moriyoshi; H. Monma; Y. Watanabe; Y. Komatsu; T. Ishigaki

doi:10.3363/prb.20.171

Phosphorus Research Bulletin

Online ISSN : 1882-2363
Print ISSN : 0918-4783
ISSN-L : 0918-4783

PREPARATION AND CHARACTERIZATION OF HYDROXYAPATITE BY A REACTION OF CALCIUM TUNGSTATE WITH PHOSPHATE

M. Kawakami, S. Shimamura, Y. Moriyoshi, H. Monma, Y. Watanabe, Y. Komatsu, T. Ishigaki

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Keywords: Calcium Tungstate, hydroxyapatite, hydrothermal

JOURNAL FREE ACCESS

2006 Volume 20 Pages 171-174

DOI https://doi.org/10.3363/prb.20.171

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Abstract

Hydroxyapatite was prepared by a reaction of CaWO₄ with phosphate at temperatures from 90 °C to 210 °C. High concentration of NaOH was appropriate for the formation processes of hydroxyapatite. The temperature dependence of reaction rate was related to the mass transport through a reaction layer. Very small activation energy of reaction, 25.5 kJ/mol, was attributed to the diffusion of Ca²⁺ ions in liquid among reaction products.

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