Journal of the American Ceramic Society, Vol.102, No.4, 1912-1920, 2019
Structure variation and energy storage properties of acceptor-modified PBLZST antiferroelectric ceramics
Energy storage capacitors with high recoverable energy density and efficiency are greatly desired in pulse power system. In this study, the energy density and efficiency were enhanced in Mn-modified (Pb0.93Ba0.04La0.02)(Zr0.65Sn0.3Ti0.05)O-3 antiferroelectric ceramics via a conventional solid-state reaction process. The improvement was attributed to the change in the antiferroelectric-to-ferroelectric phase transition electric field (E-F) and the ferroelectric-to-antiferroelectric phase transition electric field (E-A) with a small Mn addition. Mn ions as acceptors, which gave rise to the structure variation, significantly influenced the microstructures, dielectric properties and energy storage performance of the antiferroelectric ceramics. A maximum recoverable energy density of 2.64 J/cm(3) with an efficiency of 73% was achieved when x = 0.005, which was 40% higher than that (1.84 J/cm(3), 68%) of the pure ceramic counterparts. The results demonstrate that the acceptor modification is an effective way to improve the energy storage density and efficiency of antiferroelectric ceramics by inducing a structure variation and the (Pb0.93Ba0.04La0.02)(Zr0.65Sn0.3Ti0.05)O-3-xMn(2)O(3) antiferroelectric ceramics are a promising energy storage material with high-power density.