Abstract
The adjustment of the antiferroelectricity of a perovskite cell and the reversibility of antiferroelectric (AFE) -ferroelectric (FE) phase transition under electric field is very important for achieving excellent energy storage properties in AFEs. In this work, obvious change of antiferroelectricity was found in novel Na(Nb_(1-x)Sb_x)O_3 lead-free ceramics fabricated via a conventional solid-state reaction method. Repeatable double P-E loops with large E_(A-F) -28 kV/mm and large E_(F.A) -10 kV/mm were obtained in the x = 0.1 ceramic with AFE P phase at room temperature, resulting in excellent energy storage properties with W_(rec) -3.4 J/cm~3, large C_D -366 A/cm~2, high P_D -26 MW/cm3 as well as fast discharge rate t_(0.9) -75 ns. The multiscale structure analysis results indicate that the increased antiferrodistortive (oxygen octahedral tilting) degree and the decreased off-centering displacements of B-site cations after the substitution of Sb for Nb make the main contributions to the achievement of stable AFE phase and reversible AFE-FE phase transition in this work. The Na(Nb_(1-x)Sb_x)O_3 ceramics with excellent energy storage properties show large potential for the next-generation pulse power capacitor applications, and the mechanism for modulating antiferroelectricity found in this work would provide guidance for designing high-performance AFEs.
NSTL
Elsevier