Structure and Electrical Properties of 0.82BNT-0.18BKT Ceramics Modified by (Sr1/3Nb2/3)4+ Complex Ions
SHEN Yixuan1, XIE Hang1, XU Jiwen1,2, YANG Ling1,2, WANG Hua1,2
1 School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China 2 Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China
Abstract: 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.
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2020, Vol. 34 
