Relaxor ferroelectric (Na0.5Bi0.5)0.4Sr0.6TiO3-based ceramics for energy storage application

Abstract Lead-free (Na0.5Bi0.5)0.4Sr0.6TiO3-xK0.73Bi0.09NbO3 (abbreviated as NBST-xKBN) ceramics with perovskite structure were prepared by a conventional solid-state reaction method. NBST ceramics modified with KBN content demonstrate strong relaxor behavior. When x = 0.05, the optimal energy storage density (1.79J/cm3), improved recoverable energy efficiency (91.02%) and the maximum dielectric breakdown strength (22.2 kV/mm) are obtained. The discharge energy density of NBST-0.05KBN are measured under the electric field from 10 kV/mm to 16 kV/mm, exhibiting good discharge energy density (1.20J/cm3) at 16 kV/mm. Complex impedance plots of NBST-xKBN exhibit great resistivity of the ceramics. In all, these results indicate that NBST-xKBN is a potential candidate for energy storage applications.