Studies on 0.95 Bi_0.5 (Na_0.40K_0.10) TiO₃-0.05 (Ba_0.7Sr_0.3) TiO₃ ceramics for piezoelectric applications under different sintering temperature

Abstract

The domain patterns, crystal structure, and electrical properties of 0.95(Bi_0.5Na_0.40K_0.10)TiO₃-0.05(Ba_0.7Sr_0.3)TiO₃ ceramics were studied using solid state reaction technique with different sintering temperature. The samples are characterized using X-ray diffraction (XRD), ferroelectric and piezoelectric co-efficient (d₃₃). X-ray diffraction patterns indicate that the sintered ceramics exhibit pure tetragonal phase. The ceramics also exhibits good performance with piezoelectric constant d₃₃ = 128 pC/N, remnant polarization P_r = 3.71 μC/cm² and coercive field E_c = 73.2 kV/cm⁻¹. The highest polarization P_m is 6.04 μC/cm² are shown at 1200 °C. The BNKT-BST ceramic is a promising candidate which can used in actuator and piezoelectric sensor applications.

KEYWORDS:

• High coercive field
• perovskite structure
• sintering temperature

Acknowledgments

The authors would like to thank the DST for the financial support for the Project ref-SR/S2/CMP/117/2012. The authors acknowledge the multiferroic tester facility under the Department of Physics, NIT, Tiruchirappalli.