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Polarisation behaviour of calcium phosphate based ceramics


Reference:

Gittings, J. P., Bowen, C. R., Turner, I. G., Baxter, F. R. and Chaudhuri, J. B., 2008. Polarisation behaviour of calcium phosphate based ceramics. In: Marques, A. T., Silva, A. F., Baptista, A. P. M., Sá, C., Alves, F. J. L., Malheiros, L. F. and Vieira, M., eds. Advanced Materials Forum IV: Materiais 2007. Zurich: Trans Tech Publications, pp. 91-95.

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Abstract

This paper studies the effects of porosity, sintering atmosphere and composition on the polarisation behaviour of calcium phosphate (CaP) ceramics. Hydroxyapatite (HA) and atricalcium phosphate (α-TCP) materials were prepared as both dense discs and as porous samples with interconnecting porosity. Materials were sintered in either air or water vapour at 13000C and poled at a variety of temperatures, applied electric fields and time periods to optimise the polarisation properties of the materials. Thermally Stimulated Depolarisation Current (TSDC) measurements were used to investigate the degree of polarisation of the HA and a-TCP ceramics. A high depolarisation current was observed for both the porous HA and α-TCP ceramics. Sintering in water vapour also increased the depolarisation current due to reduced dehydration reactions, which result in a greater concentration of hydroxyl ions.

Details

Item Type Book Sections
CreatorsGittings, J. P., Bowen, C. R., Turner, I. G., Baxter, F. R. and Chaudhuri, J. B.
EditorsMarques, A. T., Silva, A. F., Baptista, A. P. M., Sá, C., Alves, F. J. L., Malheiros, L. F. and Vieira, M.
Uncontrolled Keywordsdehydration reactions, polarisation behaviours, sintering atmospheres, hydroxyl ions, porous samples, degree of polarisation, concentration of, water vapours, applied electric fields, time periods, depolarisation, polarisation
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Faculty of Engineering & Design > Chemical Engineering
Research CentresCentre for Advanced Sensor Technologies (CAST)
StatusPublished
ID Code13255
Additional InformationSelected, peer reviewed papers from the IV International Materials Symposium Materiais 2007 and XIII Encontro da Sociedade Portuguesa de Materiais – SPM, Faculdade de Engenharia da Universidade do Porto, April 1-4, Porto, Portugal, 2007

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