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Electrical Polarization of -Tricalcium Phosphate Ceramics

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The -tricalcium phosphate (-TCP)-sintered pellets and powders were prepared and the ability of -TCP to store an electrical charge by electrical polarization was studied. The prepared -TCP was characterized by X-ray diffractometry and Fourier transform infrared spectroscopy. Alternating-current impedance conductivity and the energy of activation required for the ionic migration of -TCP were calculated. After electrical polarization of synthesized -TCP, the thermally stimulated depolarization current was measured, and the total stored charges in the samples were calculated. The energy of activation for the relaxation of electrical polarization in the synthesized -TCP pellets and powders approximated the energy of activation required for ionic migration in the -TCP pellets. It was confirmed that -TCP has a suitable composition and structure for ion conduction and a large electrical charge is stored in both the -TCP pellets and powders. Instead of proton transport polarization in hydroxyapatite, other charge carrier, such as Ca2+ or O2−, is assumed in -TCP, in which proton is not contained.
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Document Type: Research Article

Affiliations: 1: Department of Inorganic Materials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo 113-8519, Japan 2: Affiliated Facility for Clinical and Fieldwork Practices, International University of Health and Welfare, Chiba 272-0827, Japan 3: Department of Orthopaedic and Spinal Surgery, Tokyo Medical and Dental University, Tokyo 113-8519, Japan

Publication date: August 1, 2010

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