Effect of rare earth oxides on the energy storage performance of Sr_0.7Bi_0.2TiO₃ ceramics

In this study, Sr0.7Bi0.2TiO3 (SBT) ceramics doped with Y2O3, Dy2O3 and Gd2O3 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, Sr0.7Bi0.15Y0.05TiO3 ceramics demonstrate excellent energy storage performance, with a high recoverable energy density (W-rec) of 2.4 J/cm(3) and an efficiency (eta) of 88.1% under 290 kV/cm. Furthermore, Y2O3-doped SBT ceramics exhibit a rapid discharge speed of 0.05 mu s 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.