Phase structure and energy storage performance for BiFeO3-BaTiO3 based lead-free ferroelectric ceramics

Recently, BiFeO3 BaTiO3 (BF-BT) lead-free ferroelectric ceramics have been widely concerned and deemed as one of the most promising candidates for lead-free energy-storage material because of their high spontaneous polarization and excellent energy storage properties. Herein, a series of Bi(1-z)La(z)FeO(3-x)BaTiO(3)d-yMnO(2) (BLzF-xBT-yMn at 0.45 <= x <= 0.60 mol, 0.0 <= y <= 0.4% mol and z = 0 or 0.02 mol) ceramics were prepared to reveal their energy-storage performance. With increasing x, the breakdown strength (BDS) increases, while the maximum polarization (P-max), remanent polarization (P-r), and the difference value between P-max and Pr (Delta P) decrease. Because of the high BDS and AP, a large energy storage density W-re = 1.08 J/cm(3) is achieved in BF-0.48BT ceramics as the electric field is 130 kV/cm. In addition, with increasing y and z, the increasing BDS and AP have been observed. Due to the improvement in BDS and AP, an excellent W-re = 1.22 J/cm(3) was achieved in Bi1-zLazFeO3-xBaTiO3+yMnO(2) ceramics at x = 0.48, y = 0.3% and z = 0.02. This work provides the clue for application of the high-power-energy BF-BT ceramics.