%A SHEN Yixuan, XIE Hang, XU Jiwen, YANG Ling, WANG Hua %T Structure and Electrical Properties of 0.82BNT-0.18BKT Ceramics Modified by (Sr1/3Nb2/3)4+ Complex Ions %0 Journal Article %D 2020 %J Materials Reports %R 10.11896/cldb.19110065 %P 22036-22041 %V 34 %N 22 %U {http://www.mater-rep.com/CN/abstract/article_3190.shtml} %8 2020-11-25 %X The 0.82Bi0.5Na0.5TiO3-0.18Bi0.5K0.5Ti(1-x)(Sr1/3Nb2/3)xO3 lead-free ceramics are fabricated by the traditional solid state reaction. The effects of B-site (Sr1/3Nb2/3)4+ complex ions on the microstructure, ferroelectric, dielectric, energy storage, and strain properties of BNKT-xSN ceramics are investigated. The results show that (Sr1/3Nb2/3)4+ complex ions dissolves into the lattice of BNKT matrix, and results in lattice distortion. The grain size of BNKT-xSN ceramics is greatly decreased by introducing (Sr1/3Nb2/3)4+ complex ions. The long term ferroelectric order is disturbed by (Sr1/3Nb2/3)4+ complex ions, the hysteresis loops transform from typical rectangle to slimmer shape, and the ferroelectric state gradually changes to the relaxation state. The electric field-induced strain shows that the maximum forward strain of 0.16% is obtained at x=0.20, the d33* shows the similar behavior as the unipolar stain and achieves the maximum value of 277 pm/V. The temperature-dependent dielectric spectrum shows that BNKT-xSN ceramics are weakly ferroelectric state at x<0.20, dominates by relaxation state at x≥0.25, and exists the coexistence of ferroelectric state and relaxation state at x=0.20.