Influence of Porosity on Polarisation and Electrical Properties of Hydroxyapatite Based Ceramics

J. P. Gittings Materials Research Centre, Department of Mechanical Engineering, University of Bath, Bath, UK, BA2 7AY

C. R. Bowen Materials Research Centre, Department of Mechanical Engineering, University of Bath, Bath, UK, BA2 7AY

A. C.E. Dent Materials Research Centre, Department of Mechanical Engineering, University of Bath, Bath, UK, BA2 7AY

I. G. Turner Materials Research Centre, Department of Mechanical Engineering, University of Bath, Bath, UK, BA2 7AY

F. R. Baxter Materials Research Centre, Department of Mechanical Engineering, University of Bath, Bath, UK, BA2 7AY; Department of Chemical Engineering, University of Bath, Bath, UK, BA2 7AY

S. Cartmell Institute of Science and Technology in Medicine, University of Keele, Staffordshire, UK, ST4 7QB

J. Chaudhuri Department of Chemical Engineering, University of Bath, Bath, UK, BA2 7AY

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Abstract

This paper studies the effect of porosity on the electrical properties and polarisation behaviour of hydroxyapatite based ceramics prepared in both dense and porous form. Porosity was introduced into the hydroxyapatite using either burnt-out polymer spheres to produce isolated pores or using polymer foams to create interconnected porosity. The samples were sintered in water vapour at 1300°C and polarised at 400°C with a dc voltage of 3kV/cm applied for 1 hour. Thermally stimulated depolarisation current measurements were used to investigate the degree of polarisation of the hydroxyapatite ceramics and dielectric spectroscopy used to measure the ac conductivity of the materials at the polarisation temperature. The porous materials were successfully polarised and the presence of a high surface area to volume ratio in the porous samples was thought to increase the level of polarisation.

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Acknowledgments

The authors wish to show their appreciation and gratitude to the EPSRC (EP/D013798/1) and Great Western Research (HEFCE), UK for their funding of this research.

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Influence of Porosity on Polarisation and Electrical Properties of Hydroxyapatite Based Ceramics

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Influence of Porosity on Polarisation and Electrical Properties of Hydroxyapatite Based Ceramics

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