Mesoscale origin of dielectric relaxation with superior electrostrictive strain in bismuth ferrite-based ceramics,Materials Horizons

当前位置： X-MOL 学术 › Mater. Horiz. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Mesoscale origin of dielectric relaxation with superior electrostrictive strain in bismuth ferrite-based ceramics
Materials Horizons ( IF 12.2 ) Pub Date : 2020-09-01 , DOI: 10.1039/d0mh01296c
Ting Zheng _{1,

2,

3,

4} , Jiagang Wu _{1,

2,

3,

4}

Affiliation

Electrostrictive materials fabricated with relaxor ferroelectrics have attracted much attention because of their excellent features (e.g., high precision displacement). In this study, we realized the dielectric relaxation behavior of bismuth ferrite (BiFeO₃, BFO)-based ferroelectrics by designing polar nanostructures. Accompanied by the strengthened random field and the degenerated octahedral distortion, the grain inhomogeneity featuring the coexistence of strong piezo-response polar cluster grains and weak piezo-response polar entity grains contribute to the relaxation behavior. Finally, such a dielectric relaxation behavior results in a large electrostrictive strain (S = 0.18%–0.27% @ T = 20–100 °C) together with the composition/electric field/temperature independence of Q₃₃. We believe that our research provides a new paradigm to study the dielectric relaxation behavior and optimize electrostrictive properties of perovskite materials.

中文翻译：

铋铁氧体基陶瓷介电弛豫的中尺度起源和出色的电致伸缩应变

用弛豫铁电体制造的电致伸缩材料由于其出色的功能（例如，高精度位移）而备受关注。在这项研究中，我们通过设计极性纳米结构实现了基于铋铁氧体（BiFeO ₃，BFO）的铁电体的介电弛豫行为。伴随着增强的随机场和退化的八面体形变，以强压电响应性极性团簇晶粒和弱压电响应性极性实体晶粒并存的晶粒不均匀性有助于弛豫行为。最后，这种介电弛豫行为会导致较大的电致伸缩应变（T = 0.18％–0.27％@ T= 20–100°C），以及Q ₃₃的成分/电场/温度无关性。我们认为，我们的研究提供了一种新的范式，用于研究介电弛豫行为和优化钙钛矿材料的电致伸缩性能。

更新日期：2020-09-23

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11