A-site compositional modulation in barium titanate based relaxor ceramics to achieve simultaneously high energy density and efficiency

Dielectric ceramics capacitors (DCC) with excellent energy storage performance (ESP) and charge-discharge performance (CDP) is very critical in the field of advanced electronics and power systems. A strategy that improves the ESP of 0.6Ba(Zr0.2Ti0.8)O-3-0.4(Na0.5Bi0.5)TiO3 (BZT-NBT) ceramics was proposed via Sr2+ doping. XRD and SEM results confirmed that 0.6(Ba1-xSrx)(Zr0.2Ti0.8)O-3-0.4(Na0.5Bi0.5)TiO3 (x = 0, 0.1, 0.2, 0.3, 0.4) (BSZT-NBT) ceramics formed dense and stable perovskite solid solutions. The relaxor ferroelectric (RFE) properties of BSZT-NBT ceramics were also well proved by dielectric behaviors. A large recoverable energy storage density (Wrec) and large efficiency (eta) of 3.72 J cm-3 and 94.03 % (x = 0.3) can be simultaneously obtained at 289 kV cm-1. ESP of BSZT-NBT (x = 0.3) ceramics at 180 kV cm-1 exhibit good frequency (1-100 Hz) and temperature (room temperature (RT)-120 degrees C) stability. BSZT-NBT (x = 0.3) ceramics at 120 kV cm-1 exhibit a prominent power density (PD) and rapid discharge rate (t0.9) of of 37.62 MW cm-3 and 70.6 ns. All evidences confirm that introduction of Sr2+ into A-site of barium titanate-based ceramics could effectively improve ESP.