Effect of rare earth oxides on the energy storage performance of Sr0.7Bi0.2TiO3 ceramics

Abstract In this study, Sr 0.7 Bi 0.2 TiO 3 (SBT) ceramics doped with Y 2 O 3 , Dy 2 O 3 and Gd 2 O 3 rare earth oxides were designed and prepared by the conventional solid-state reaction method. The results show that all ceramics exhibit typical relaxor ferroelectric behavior, and the breakdown strength (BDS) of SBT ceramics is improved. Among them, Sr 0.7 Bi 0.15 Y 0.05 TiO 3 ceramics demonstrate excellent energy storage performance, with a high recoverable energy density ( W rec ) of 2.4 J/cm 3 and an efficiency ( η ) of 88.1% under 290 kV/cm. Furthermore, Y 2 O 3 -doped SBT ceramics exhibit a rapid discharge speed of 0.05 µs and a high power density ( P D ) of 144.1 MW/cm 3 under 300 kV/cm in charge-discharge tests. These characteristics have significant potential in pulse power applications.