Remarkable energy storage properties in (Bi0.5Na0.5)TiO3-based quasilinear relaxor ferroelectrics via superparaelectric regulation

The utilization of electrostatic energy storage technology, which relies on dielectrics, is of utmost importance in the realm of advanced electronics and high-power electrical systems. However, there is still a lack of a universally applicable method to simultaneously attain elevated recoverable energy density (Wrec) and high efficiency (eta). Herein, based on the design of superparaelectric regulation, SmFeO3 was introduced into the typical 0.6Bi0.5Na0.5TiO3-0.4Sr0.7Bi0.2TiO3 relaxor. A nearly linear P-E loop with near-zero remanent polarization and excellent comprehensive performance were realized in the 0.9(0.6Bi0.5Na0.5TiO3-0.4Sr0.7Bi0.2TiO3)-0.1SmFeO3 ceramic. A remarkable Wrec value of 7.2 J & sdot;cm ? 3 together with a high eta of 86% was obtained at an improved Weibull breakdown electric field (Eb) of 430 kV & sdot;cm ? 1. Wherein the ultra-small nanodomain size and the increased linearity of the P-E loop based on superparaelectric regulation strategy at largely enhanced Eb are responsible for the improvement of Wrec and eta. Therefore, the method of superparaelectric regulation realized on relaxor ferroelectrics opens a new avenue for the progress of cutting-edge ceramic capacitors.