Simultaneously achieving high energy-storage density and power density under low electric fields in NBT-based ceramics

Aiming at the problem that power density and energy density are difficult to obtain simultaneously under low field, a novel composition (1-x)Na0.5Bi0.5TiO3-xBaZn(1/3)Ta(2/3)O(3)((1-x)NBT-xBZT) was designed and fabricated via solid-state methods. With the addition of BZT, the crystal lattice, structural symmetry, grain size, and dense degree were all increased proved by XRD, Raman, and Archimedes drainage method et al. Because of the enhancement of relaxor behavior, the x=0.10 sample displayed a high permittivity epsilon(r) of 2871 +/- 15% and a low dielectric loss tan delta <= 0.025 in the wide temperature range of 60-400 degrees C. This ceramic also showed maximum recoverable energy density W-d (2.07 J/cm(3)) with high efficiency eta (71.5%) under a low field of 150 kV/cm. Moreover, pulse discharge testing proved that this ceramic possessed both a significant discharge energy density W-D (0.96 J/cm(3)) and a record high power density P-D (108.54 MW/cm(3)). This work provided a promising material for high power and energy applications.