Pressure driven depolarization behavior of Bi0.5Na0.5TiO3 based lead-free ceramics
Pressure driven depolarization behavior of Bi0.5Na0.5TiO3 based lead-free ceramics
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DOI：
10.1063/1.4984088
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发表时间：
2017-05
影响因子：
4
通讯作者：
Zhen Liu;Weijun Ren;Hengchang Nie;P. Peng;Yun Liu;Xianlin Dong;F. Cao;Genshui Wang
中科院分区：
文献类型：
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作者：
Zhen Liu;Weijun Ren;Hengchang Nie;P. Peng;Yun Liu;Xianlin Dong;F. Cao;Genshui Wang
压力驱动的去极化行为因其科学意义和实际应用而受到广泛的研究。然而，以前的相关研究都是基于含铅铁电（FE）材料，导致有害的环境问题。本文报道了Bi基无铅0.97[（1-x）Bi_（0.5）Na_（0.5）TiO_3-xBiAl_（O_3）]-0.03 K_（0.5）Na_（0.5）Nb_（O_3）（BNT-x）陶瓷的压力驱动退极化行为。特别是当静水压力从0 MPa增加到495 MPa时，BNT-0.04的极化率从30.7 μC/cm ~ 2下降到8.2 μC/cm ~ 2，比初始值下降了约73%。所观察到的去极化现象与压力诱导的极性FE-非极性弛豫相变有关。结果表明，BNT基陶瓷作为有前途的无铅候选人的机械-电能转换应用的压力驱动的去极化行为的基础上。
Pressure driven depolarization behavior has been widely investigated for its scientific significance and practical applications. However, previous related studies were all based on lead-containing ferroelectric (FE) materials leading to detrimental environmental concerns. In the present work, we report the pressure driven depolarization behavior in Bi-based lead-free 0.97[(1-x)Bi0.5Na0.5TiO3-xBiAlO3)]-0.03K0.5Na0.5NbO3 (BNT-x) ceramics. Particularly, with increasing hydrostatic pressure from 0 MPa to 495 MPa, the remanent polarization of BNT-0.04 decreases from 30.7 μC/cm2 to 8.2 μC/cm2, reducing ∼73% of its initial value. The observed depolarization phenomenon is associated with the pressure induced polar FE-nonpolar relaxor phase transition. The results reveal BNT based ceramics as promising lead free candidates for mechanical-electrical energy conversion applications based on the pressure driven depolarization behavior.