Improved energy storage properties of La0.33NbO3 modified 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 ceramic system.

(1−x)[0.94Bi_0.5Na_0.5TiO₃ – 0.06BaTiO₃]−xLa_0.33NbO₃ (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) (BNBT-LN) bulk lead-free relaxor ferroelectric ceramics were synthesized via solid-state sintering method. Phase, microstructure and energy storage properties were determined. The X-ray diffraction (XRD) revealed a single perovskite phase for compositions of x ≤ 0.02, while the second phase of Bi₂Ti₂O₇ along with the parent phase for x ≥ 0.04. Dense microstructure with a decrease in grain size has been achieved via LN doping. The addition of LN decreased the remnant polarization (P_r), and coercive field (E_c), while increased the difference between the maximum polarization (P_max) and remnant polarization (P_r). The high energy-storage density of 2.96 J/cm ³ and high recoverable energy density of 1.66 J/cm³ at a breakdown electric field of 214 kV/cm were achieved for the composition of x = 0.02 with good temperature stability satisfying the condition of Δε_r /ε _{r200 °C} ≤ ± 15% in a working temperature range of 70 °C to 400 °C. Similarly, a less discharge time of < 4 µs achieved in this study for x = 0.02. These results demonstrate that this material may be a good candidate material for power pulsed applications. [ABSTRACT FROM AUTHOR]