INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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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
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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 |
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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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Published: 02 December 2020
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Fund:This work was financially supported by the National Natural Science Foundation of China (11664006), the Natural Science Foundation of Guangxi (2017GXNSFDA198024, 2018GXNSFDA281042, 2018GXNSFAA294039). |
About author:: Yixuan Shenis a graduate student at Guilin University of Electronic Technology in September 2018, focuses on the study of piezoelectric ceramics and energy harvesting.Jiwen Xuobtained his Ph.D. degree in material from Shaanxi Normal University in 2014, and engaged in postdoctoral research in Guangdong Fenghua Advanced Technology (Holding) Co.,Ltd in 2015—2017. He is currently a professor at School of Materials Science and Engineering, Guilin University of Electronic Technology. He has published more than 50 papers and obtained 9 authorized patents. The research interests are piezoelectric and ferroelectric ceramics, oxide nano powders, fine ceramic targets. |
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