Enhanced energy storage performance and thermal stability in relaxor ferroelectric (1-x)BiFeO3-x(0.85BaTiO3-0.15Bi(Sn0.5Zn0.5)O3) ceramics

Lead-free (1-x)BiFeO3-x(0.85BaTiO(3)-0.15Bi(Sn0.5Zn0.5)O-3) [(1-x)BF-x(BT-BSZ), x=0.45-0.7] ceramic samples were prepared by solid phase sintering. It is revealed that the pure single-phase perovskite structure can be obtained in samples with x >= 0.6. With increasing x, the measured ferroelectric hysteresis loop becomes gradually slimmed in accompanying with reduced remnant polarization, and a clear ferroelectric-relaxor transition at x = 0.65 is identified. Furthermore, the measured electric breakdown strength can be significantly enhanced with increasing x, and the optimal energy storage performance is achieved at x = 0.65, characterized by the recoverable energy storage density up to approximate to 3.06 J/cm(3) and energy storage efficiency as high as approximate to 92 %. Excellent temperature stability (25 degrees C-110 degrees C) and fatigue endurance (>10(5) cycles) for energy storage are demonstrated. Our results suggest that the BF-based relaxor ceramics can be tailored for promising applications in high energy storage devices.

Automated summary

Lead-free (1-x)BiFeO3-x(0.85BaTiO(3)-0.15Bi(Sn0.5Zn0.5)O-3) ceramic samples were prepared by solid phase sintering, showing pure single-phase perovskite structure at x >= 0.6 and a clear ferroelectric-relaxor transition at x = 0.65. The optimal energy storage performance was achieved at x = 0.65 with high energy storage density and efficiency. These BF-based relaxor ceramics demonstrate excellent temperature stability and fatigue endurance, suggesting promising applications in high energy storage devices.