Enhanced energy storage properties of BaTiO3-Bi0.5Na0.5TiO3 lead-free ceramics modified by SrY0.5Nb0.5O3

In this work, a novel lead-free relaxor-ferroelectric ceramics of (1-x)(0.65BaTiO(3)-0.35Bi(0.5)Na(0.5)TiO(3))-xSrY(0.5)Nb(0.5)O(3) ((1-x)BTBNT-xSYN x = 0.02-0.12), was designed and prepared by the conventional solid state reaction method. The results show that all of the sintered samples have a perovskite structure. The Curie Temperature (T-c) moves to the low temperature side which causes the high dielectric constant at room temperature, and the ferroelectric hysteresis loop becomes slimmer and slimmer with increasing the content of SYN. Meanwhile, the optimal energy storage properties can be obtained in 0.92BTBNT-0.08SYN ceramic with an impressive discharged energy density (W-rec) of 1.36 J/cm(3) under 152 kV/cm, and the charge-discharge efficiency reaches 74.3%. Therefore, all these results indicate that (1-x)BTBNT-xSYN lead-free ceramics can be applied for pulsed power capacitors. (C) 2018 Elsevier B.V. All rights reserved.