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Synthesis and Stability of Potassium/Carbonate Co-Substituted Hydroxyapatites

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Abstract:

A systematic study of the stability of potassium/carbonate co-substituted hydroxyapatite has been carried out, with samples synthesized by aqueous precipitation according to the chargebalanced mechanism: Ca10-xKx(PO4)6-x(CO3)x(OH)2 Samples up to x=1.0 were prepared and their stability determined by heating at a range of temperatures in both air and CO2 environments. Results showed that whilst samples up to x=1.0 can be prepared phase-pure, the stability of these materials is strongly dependent on sintering temperature with the full range of compositions only being stable at 600°C in CO2. The c unit cell parameter increases linearly with x, and, for a fixed composition, decreases linearly with temperature indicating loss of carbonate from the A-site. FTIR showed that samples contained carbonate at both A- and B-sites, and that carbonate content increased with x.

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Periodical:

Key Engineering Materials (Volumes 361-363)

Pages:

207-210

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.361-363.207

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Online since:

November 2007

Authors:

J. Whyte, D.J. Hadden, Iain R. Gibson, J.M.S. Skakle

Keywords:

Carbonate, Hydroxyapatite (HAP), Potassium, Substitution, X-Ray Diffraction (XRD)

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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References

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