摘要
Sr_(0.7)Bi_(0.2)TiO_(3)(SBT)by increasing the proportion and size of polar nano-region.Meanwhile,the BDS remains a high level with x<0.38 attributed to the addition of KBT with a large band gap.As a result,the 0.62SBT-0.38KBT exhibits a high energy storage density of 2.21 J/cm^(3)with high h of 91.4%at 220 kV/cm and superior temperature stability(-55~150℃),frequency stability(10~500 Hz)and fatigue resistance(105 cycles).Moreover,high pulsed discharge energy density(1.81 J/cm^(3)),high power density(49.5 MW/cm3)and great thermal stability(20~160℃)are achieved in 0.62SBT-0.38KBT.Based on these excellent properties,the 0.62SBT-0.38KBT are suitable for pulsed power systems.This work provides a novel strategy and systematic study for improving energy storage properties of SBT.
基金
We are grateful to the National Natural Science Foundation of China(Grant No.51672038).
