Energy storage properties of BiTi0.5Zn0.5O3-Bi0.5Na0.5TiO3-BaTiO3 relaxor ferroelectrics

(1-x)BiTi0.5Zn0.5O3-x(0.935Bi(0.5)Na(0.5)TiO(3)-0.065BaTiO(3)) (abbreviated as BTZx) lead-free ceramics were prepared by using a conventional solid state reaction method and their composition and temperature dependent energy-storage properties were investigated. The addition of BiTi0.5Zn0.5O3 sharply decreased the content of ferroelectric phase, leading to lowered remanent polarization and coercive field. A large energy storage density (W) of 1.04 J cm(-3) was achieved at 95 kV cm(-1) for BTZ0.916. In the high temperature region, the remanent polarization was suppressed, while maximum polarization still maintained at a high level. Significantly enhanced W of similar to 0.952 J cm(-3) at 80 kV cm(-1) was obtained with a relatively high efficiency of similar to 0.8, making these materials attractive in energy storage applications. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.