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

Abstract

Abstract 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 Bi1-zLazFeO3-xBaTiO3+yMnO2 (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 (Pmax), remanent polarization (Pr), and the difference value between Pmax and Pr (ΔP) decrease. Because of the high BDS and ΔP, a large energy storage density Wre = 1.08 J/cm3 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 ΔP have been observed. Due to the improvement in BDS and ΔP, an excellent Wre = 1.22 J/cm3 was achieved in Bi1-zLazFeO3-xBaTiO3+yMnO2 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.