Faster synthesis of A-type carbonated hydroxyapatite powders prepared by high-temperature reaction

Duncan A. Nowick, Janet M. S. Skakle, Iain R Gibson* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Synthesis of A-type carbonated hydroxyapatite (CHA) materials has typically involved heating of a hydroxyapatite composition for 24 hours or greater. In this study, a hydroxyapatite powder was heated at 800, 900 or 1000°C for 1, 8 or 16 hours in dry CO2. Samples heated for 8 and 16 hours at 900/1000°C were fully-carbonated A-type CHAs. After only one hour at 1000°C, the carbonate content approached 95% of the theoretical maximum. Preparing compositions with more than 95% of the theoretical maximum with reduced thermal energy (1000°C for 1 hour, or 900°C for 8 hours) results in powders with higher surface areas and a reduced level of sintering, compared to powders prepared with typical thermal treatments reported for A-type CHAs, such as 1000°C for 16 hours. As far as the authors are aware, these are the shortest heating times reported for the preparation of fully-carbonated A-type CHAs which is significant for future applications of such powders, particularly in applications beyond medical devices such as chromatography, remediation and carbon capture.
Original languageEnglish
Pages (from-to)3318-3327
Number of pages10
JournalAdvanced Powder Technology
Issue number8
Early online date29 Jun 2020
Publication statusPublished - Aug 2020


  • Hydroxyapatite
  • carbonated
  • A-type substitution
  • high-temperature


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