ENERGY STORAGE CHARACTERISTICS OF (1-x)BNKT – xBCZT CERAMICS

Abstract

From this Bi₄Ti₃O₁₂, we have successfully studied the synthesis of lead-free piezoelectric(1-x)Bi_0.5(Na_0.4K_0.1)TiO₃ - x(Ba_0.844Ca_0.156)(Zr_0.096Ti_0.904)O₃ (BNKT-BCZT, x = 0.0, 0.025, 0.05, 0.075, and 0.1) ceramics using orientation technique. The effect of BCZT contents on the structure and the characteristics of relaxor ferroelectric of the ceramics were investigated. Experimental results show that with the increase in the BCZT content in the range of 0 to 0.1, the phase structure of the ceramics transforms from the rhombohedral R3c to tetragonal P4bm structure by the Rietveld refinement of XRD data.

At x = 0.05: high remnant polarization P_r = 16 µC/cm², low coercive field E_c = 25 kV/cm, Lotgering factor (f) = 0.65, and energy-storage density = 0.43 J/cm³ at 50 kV/cm. The BCZT doping improved the energy storage density of BNKT ceramics by nearly 400% compared with undoped BNKT ceramics. Thus, the ceramic material has great potential for electrical-energy-storage applications.