Defect dipole induced large recoverable strain and high energy-storage density in lead-free Na0.5Bi0.5TiO3-based systems
Defect dipole induced large recoverable strain and high energy-storage density in lead-free Na0.5Bi0.5TiO3-based systems
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无铅 Na0.5Bi0.5TiO3 体系中缺陷偶极子引起的大可恢复应变和高能量存储密度
DOI：
10.1063/1.4950974
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发表时间：
2016-05-16
影响因子：
4
通讯作者：
Fei, Weidong
中科院分区：
文献类型：
--
作者：
Cao, Wenping;Li, Weili;Fei, Weidong
在这篇文章中，我们提出了一种有效的途径，通过诱导缺陷偶极子到Na0.5Bi0.5TiO3 （NBT）基弛缓铁电体中来获得大的可恢复应变、纯电伸缩效应和高能量存储密度。由于受体诱导的缺陷偶极子的存在，可以观察到具有高最大极化（Pmax）和可忽略的剩余极化（Pr）的压缩和双极化磁滞回线。11 mol / l时，可获得0.24%的大恢复应变，迟滞很小，电致伸缩系数为0.022 m4 C2，具有纯电致伸缩特性。‰Mn-doped。同时，由于Pmax-Pr值增大（36.8 μC/cm2）和较高的电场（95 kV/cm），在相同成分下，获得了1.06 J/cm3的高可回收能量密度，具有良好的温度稳定性。我们的研究成果将为铁电材料在高精度定位装置和高分辨率电子器件中的应用开辟令人兴奋的机遇。
In this letter, we propose an effective route to obtain large recoverable strain, purely electrostrictive effects and high energy-storage density by inducing defect dipoles into Na0.5Bi0.5TiO3 (NBT)-based relaxor ferroelectrics. It has been found that pinched and double polarization hysteresis loops with high maximum polarization (Pmax) and negligible remanent polarization (Pr) can be observed due to the presence of acceptor-induced defect dipoles. A large recoverable strain of 0.24% with very little hysteresis and high electrostriction coefficient of 0.022 m4 C2 with purely electrostrictive characteristics were acquired when 11 mol. ‰ Mn-doped. Meanwhile, a high recoverable energy density of 1.06 J/cm3 with excellent temperature stability was obtained at the same composition owing to the enlarged value of Pmax-Pr (36.8 μC/cm2) and relatively high electric field (95 kV/cm). Our achievement can open up the exciting opportunities for ferroelectric materials in high-precision positioning devices and high ele...