Gaint electric field-induced strain and ferroelectric behavior of Bi0.5Na0.4K0.1TiO3-Na1-xLixNbO3 lead-free ceramics

Qiang Li, Li Ning, Chao Wang, Huiqing Fan

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摘要

0.96 Bi0.5Na0.4K0.1TiO3-0.04Na1-xLixNbO3 (BNKT-100xLi, x = 0, 0.25, 0.5, 0.75, 1.0) lead-free ceramics were prepared using traditional solid-state reaction method. X-ray diffraction patterns confirmed the pure perovskite structure of sintered ceramics. Electric field and composition-dependent strain behavior was investigated. The highest bipolar strain of 0.45% and the unipolar strain 0.443% was achieved at x = 0.75 under the applied electric field of 70 kV/cm. Meanwhile, the corresponding normalized strain (d33*) reached to 633 pm/V. Moreover, the giant strain exhibited excellent thermal stability and fatigue-resistance (within 105 switching cycles) properties, and the large strain was attributed to the reversible electric field-induced transition between relaxor and ferroelectric phase.

源语言英语
文章编号114819
期刊Materials Science and Engineering: B
263
DOI
出版状态已出版 - 1月 2021

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