Abstract
Environmental-friendly relaxation ferroelectrics are anticipated as an excellent comprehensive energy storage performance materials due to their near-zero remnant polarization and slim hysteresis loop. Here, the relaxor ferroelectrics (1-x)Na0.5Bi0.5TiO3-x(Sr0.7La0.2)(Ti0.8Sn0.2)O3 ((1-x)NBT-xSLTS) ceramics with outstanding energy storage performances are synthesized by solid-state reaction. The dielectric properties exhibit obvious frequency dispersion characteristics, and the diffusion coefficient (γ) increases from 1.62 to 1.75 with the doping of SLTS. Also, a large polarization difference (∆P = 20.08 μC/cm2) and a high breakdown strength (Eb = 280 kV/cm) are also achieved simultaneously. As a result, a high recoverable energy density Wrec (~ 2.52 J/cm3), together with a satisfactory efficiency η (~ 89.3%), are attained in 0.55NBT-0.45SLTS ceramic. Additionally, the corresponding samples also show satisfactory stability over the wide temperature range of 20–140 °C, with the variables of Wrec and η are less than 7% and 2%, respectively. More importantly, this ceramic has an ultrashort discharge time τ0.9 (53 ns) and a high current density J (721.86 A/cm2). All these results reveal that 0.55NBT-0.45SLTS ceramic is an ideal lead-free next-generation candidate material for pulsed power systems.
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