Dielectric and Piezoelectric Properties of (1-x)Bi(Sc_0.9(Zn_1/2Ti_1/2)_0.1)O₃-xPbTiO₃ Ceramics

Abstract

(1-x)Bi(Sc_0.9(Zn_1/2Ti_1/2)_0.1)O₃-xPbTiO₃ ((1-x)BSZT-xPT) (0.58 ≤ x ≤ 0.66) ceramics were prepared by the traditional ceramic process. The evolution of phase structure with PT content in (1-x)BSZT-xPT ceramics were investigated by XRD. The MPB composition in BSZT-PT system moved from x = 0.64 to x = 0.60 compared to BiScO₃-PbTiO₃ (BS-PT) ceramics. The piezoelectric properties d₃₃ and k_p of MPB composition in BSZT-PT system were studied. The phase transition temperature was 463°C for x = 0.60. At Curie temperature, the abnormal large dielectric constants were observed, due to compensated chemical valence of bismuth and lead elements forming high insulation layer in the grain boundary by the high ion diffuse.

Keywords:

• Piezoelectric
• morphotropic phase boundary
• high Curie temperature

Acknowledgments

This work was supported by National Natural Science Foundation of China No.50872106 and the National Basic Research Program of China (973 Program) No. 2009CB623306.