通过钙掺杂在BaTiO3–Bi(Mg0.5Ti0.5)O3基弛豫铁电陶瓷中实现优异的能量存储性能

Dielectric ceramics derived from binary solid solutions are promising candidates for pulse-device capacitors owing to their excellent relaxation properties. The results demonstrate that 0.8Ba 1− x Ca x TiO 3 –0.2Bi(Mg 0.5 Ti 0.5 )O 3 (BCT–BMT– x Ca) exhibits a high breakdown strength and dielectric constant, enhancing its energy storage capabilities. At a calcium doping level of 0.16, the material achieves the highest electric field before breakdown (Maximum electric field E max = 610 kV/cm), a 42% improvement over the undoped component, with maximum recoverable energy storage density ( W rec = 6.74 J/cm 3 , η = 83.05%). Pulse charge–discharge tests revealed an ultrafast discharge response (31 ns) under 300 kV/cm and high current density and power density ( C D = 1295 A/cm 2 , P D = 195 MW/cm 3 ). These results suggest that BCT–BMT ceramics have significant potential in high-pulsed-power applications owing to their excellent performance.