Realizing high energy storage performances and ultrafast charge-discharge rate of NaNbO3-based ceramics for application in pulse power capacitors.

NaNbO 3 (NN)-based lead-free dielectric ceramics exhibit great energy storage density and environmental friendliness, making them attractive options for use in pulse power capacitors. Herein, novel NN-based ceramics, namely, 0.7Na 1-3 x Sm x NbO 3 -0.3(Sr 0.7 Bi 0.2)(Ti 0.8 Zr 0.2)O 3 , were designed via composition modification in order to improve recyclable energy storage density (W rec), dielectric breakdown strength (E b), and charge-discharge rate. The phase composition, microstructure, dielectric performances and energy storage performances of the resultant ceramics were methodically studied. Ultimately, a large E b of 380 kV/cm and a great W rec of 3.2 J/cm3 were attained by the NN-SBTZ-0.01Sm ceramic. In addition, NN-SBTZ-0.01Sm ceramic exhibited outstanding temperature and frequency stabilities, which facilitated the application of dielectric capacitors. Meanwhile, high current density (C D = 268 A/cm2), and ultrafast discharge rate (t 0.9 = 35 ns) made NN-SBTZ-0.01Sm ceramic have potential applications in pulse power systems. [ABSTRACT FROM AUTHOR]