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Electrical characterization of hydroxyapatite-based bioceramics


Reference:

Gittings, J. P., Bowen, C. R., Dent, A. C. E., Turner, I. G., Baxter, F. R. and Chaudhuri, J. B., 2009. Electrical characterization of hydroxyapatite-based bioceramics. Acta Biomaterialia, 5 (2), pp. 743-754.

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Official URL:

http://dx.doi.org/10.1016/j.actbio.2008.08.012

Abstract

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.

Details

Item Type Articles
CreatorsGittings, J. P., Bowen, C. R., Dent, A. C. E., Turner, I. G., Baxter, F. R. and Chaudhuri, J. B.
DOI10.1016/j.actbio.2008.08.012
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Faculty of Engineering & Design > Chemical Engineering
Research CentresCentre for Advanced Sensor Technologies (CAST)
RefereedYes
StatusPublished
ID Code12722
Additional InformationGittings, J. P. Bowen, C. R. Dent, A. C. E. Turner, I. G. Baxter, F. R. Chaudhuri, J. B.

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