The Structure and Properties of Electroceramics for Bone Graft Substitution


Article Preview

Hydroxyapatite (HA) and barium titanate (BT) powders were mixed and sintered to form hydroxyapatite – barium titanate (HABT) ceramics. These materials were then poled and their piezoelectric properties were measured. The microstructure of unpoled samples was examined using scanning electron microscopy (SEM).The piezoelectric constants (d33 and d31) of the ceramics were found to be dependent on the proportion of BT in the ceramic In materials containing less than 70% BT, no piezoelectric effect was found. Above this value, the piezoelectric constant increased with the addition of BT up to a value of 108pCN-1 for pure BT. Values of d33 for ceramics containing more than 80% BT are above values previously shown to have a positive influence on bone growth in vivo. SEM analysis indicated that the grain size within the materials decreased as the proportion of BT in the material was reduced. Examination of the microstructure of the ceramics indicated the presence of electrical domains in the 100% BT and 95% BT ceramics. Domains were not visible below 95% BT. The reduction in grain size may influence the reduction in piezoelectric activity within the materials but cannot be considered to be the only cause.



Key Engineering Materials (Volumes 361-363)

Main Theme:

Edited by:

Guy Daculsi and Pierre Layrolle




F.R. Baxter et al., "The Structure and Properties of Electroceramics for Bone Graft Substitution", Key Engineering Materials, Vols. 361-363, pp. 99-102, 2008

Online since:

November 2007




[1] E. Fukada and I. Yasuda: Journal of the Physical Society of Japan Vol. 12(10) (1957), p.1158.

[2] S.C. Cowin and M.L. Moss in Bone Mechanics Handbook, edited by S.C. Cowin CRC Press, Boca Raton, FL (2001).

[3] G.W. Hastings and F.A. Mahmud: Journal of Biomedical Engineering Vol. 10 (1988), p.515.

[4] C.T. Laurencin: Bone Graft Substitutes (ATSM International, West Conshohocken, PA, 2003).

[5] J.Q. Feng, H.P. Yuan and X.D. Zhang: Biomaterials Vol. 18(23) (1997), p.1531.

[6] B. Callegari and W.D. Ballengero: Acta Orthopaedica Brasileira Vol. 12 (2004), p.160.

[7] W. Hackenberger, M.J. Pan, V. Vedula, P. Pertsch, W.W. Cao, C. Randall and T. Shrout (1998), SPIE, 3324: 28-. 36.

[8] W. Cau and C.A. Randall: Journal of Physics and Chemistry of Solids Vol. 57(10) (1996), pp.1499-1505.

[9] G. Arlt: Journal of Materials Science Vol. 25 (1990) p.2655.

[10] H. Takahashi, Y. Numamoto, J. Tani and S. Tsurekawa: Japanese Journal of Applied Physics Vol. 45(9B): p.7405.