Synthesis and Stability of Potassium/Carbonate Co-Substituted Hydroxyapatites

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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)

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Edited by:

Guy Daculsi and Pierre Layrolle

Pages:

207-210

Citation:

J. Whyte et al., "Synthesis and Stability of Potassium/Carbonate Co-Substituted Hydroxyapatites", Key Engineering Materials, Vols. 361-363, pp. 207-210, 2008

Online since:

November 2007

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$38.00

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