Polarisation behaviour of calcium phosphate based ceramics
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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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.
|Item Type||Book Sections|
|Creators||Gittings, J. P., Bowen, C. R., Turner, I. G., Baxter, F. R. and Chaudhuri, J. B.|
|Editors||Marques, A. T., Silva, A. F., Baptista, A. P. M., Sá, C., Alves, F. J. L., Malheiros, L. F. and Vieira, M.|
|Uncontrolled Keywords||dehydration reactions,polarisation behaviours,sintering atmospheres,hydroxyl ions,porous samples,degree of polarisation,concentration of,water vapours,applied electric fields,time periods,depolarisation,polarisation|
|Departments||Faculty of Engineering & Design > Mechanical Engineering|
Faculty of Engineering & Design > Chemical Engineering
|Research Centres||Centre for Advanced Sensor Technologies (CAST)|
|Additional Information||Selected, 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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