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Piezoelectric composites based on hydroxyapatite/barium titanate


Reference:

Bowen, C. R., Raman, K. V. S. and Topolov, Y. Y., 2008. Piezoelectric composites based on hydroxyapatite/barium titanate. In: CIMTEC 2008 - Proceedings of the 3rd International Conference on Smart Materials, Structures and Systems - Smart Materials and Micro/Nanosystems. Vol. 54. Trans Tech Publications Ltd, pp. 1-6.

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Abstract

This paper reports experimental and modelling results on the manufacture and properties of hydroxyapatite / BaTiO3 ceramic composites and studies their electromechanical properties with ferroelectric ceramic volume fractions, mFC ≥ 0.7. In these composites the bio-active properties of hydroxyapatite are combined with the electromechanical properties of a perovskite-type ferroelectric BaTiO3 ceramic in an attempt to create a novel polarised bone-substitute material. Experimental results of the volume fraction dependences of the effective piezoelectric coefficients d *31(mFC), d* 33(mFC) and dielectric permittivity Ε *σ33(mFC) of stress free samples are analysed within the framework of a modified model of a porous piezo-active material that is described in terms of 1-3 (one-dimensional rods in a continuous matrix) and 2-2 connectivity (laminates). The role of several structural elements and physical factors in forming the electromechanical properties of the composites is discussed. It is shown that performance of these materials typical properties are 5 pC / N < |d*31|< 45 pC / N, 20 pC / N < d*33< 100 pC / N and 400 < Ε*σ33| Ε0< 1300.

Details

Item Type Book Sections
CreatorsBowen, C. R., Raman, K. V. S. and Topolov, Y. Y.
Uncontrolled Keywordspiezoelectricity, oxide minerals, hydroxyapatite, materials properties, ferroelectric ceramics, perovskite, titration, apatite, ferroelectricity, piezoelectric transducers
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Research CentresCentre for Advanced Sensor Technologies (CAST)
StatusPublished
ID Code13961
Additional Information3rd International Conference on Smart Materials, Structures and Systems - Smart Materials and Micro/Nanosystems, CIMTEC 2008, June 08,2008 - June 13,2008

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