Electrical characterization of hydroxyapatite-based bioceramics

J P Gittings, Christopher R Bowen, Andrew C E Dent, Irene G Turner, Frances R Baxter, Julian B Chaudhuri

Research output: Contribution to journalArticlepeer-review

157 Citations (SciVal)


This paper studies the AC conductivity and permittivity of hydroxyapatite (HA)-based ceramics from 0.1 Hz-1 MHz at temperatures from room temperature to 1000 degrees C. HA-based ceramics were prepared either as dense ceramics or in porous form with interconnected porosity and were sintered in either air or water vapour. Samples were thermally cycled to examine the influence of water desorption on AC conductivity and permittivity. Surface-bound water was thought to contribute to conductivity for both dense and porous materials at temperatures below 200 degrees C. At temperatures below 700 degrees C the permittivity and AC conductivity of HA was also influenced by the degree of dehydration and thermal history. At higher temperatures (700-1000 degrees C), bulk ionic conduction was dominant and activation energies were of the order of similar to 2 cV, indicating that hydroxyl ions are responsible for conductivity.
Original languageEnglish
Pages (from-to)743-754
Number of pages12
JournalActa Biomaterialia
Issue number2
Early online date4 Sept 2008
Publication statusPublished - Feb 2009


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