Frequency dependence of the relaxor-to-ferroelectric transition under applied electrical and mechanical fields
Frequency dependence of the relaxor-to-ferroelectric transition under applied electrical and mechanical fields
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DOI：
10.1016/j.jeurceramsoc.2018.12.026
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发表时间：
2019-04
影响因子：
5.7
通讯作者：
Alexander Martin;N. Khansur;K. Riess;K. Webber
中科院分区：
文献类型：
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作者：
Alexander Martin;N. Khansur;K. Riess;K. Webber
弛豫铁电体是一种独特的材料类别，其潜在的微观过程尚未完全理解。特别是，从弛豫态到长程铁电有序的电场和机械场调制转变已被发现是某些无铅铁电系统中大的单极应变响应的起源。重要的是，这种转变的动力学不同于正常铁电体中发现的畴壁成核和生长，显著改变了频率响应。在这项研究中，（Na 1/2 Bi 1/2）TiO 3基无铅弛豫铁电体的机电行为下施加的外部机械和电场超过几个数量级的加载速率。根据加载的历史，它是可能的，直接调查弛豫铁电过渡以及畴壁运动在同一个样品。这些数据表明这些非线性滞后过程之间的频率响应的变化。
Relaxor ferroelectrics are a unique material class with underlying microscopic processes that are yet to be fully understood. In particular, the electrical and mechanical field-modulated transition from the relaxor state to long-range ferroelectric order has been found to be the origin of the large unipolar strain response in some lead-free ferroelectric systems. Importantly, the dynamics of this transition are different than the domain wall nucleation and growth found in normal ferroelectrics, significantly changing the frequency response. In this study, the electromechanical behavior of a (Na1/2Bi1/2)TiO3-based lead-free relaxor ferroelectric is shown under applied external mechanical and electric field over several orders of magnitude in loading rate. Depending on the loading history, it is possible to directly investigate both the relaxor-to-ferroelectric transition as well as domain wall motion in the same sample. These data demonstrate the variations in frequency response between these nonlinear hysteretic processes.