Design of superior electrostriction in BaTiO_(3) -based lead-free relaxors via the formation of polarization nanoclusters  

作　　者：Lu Wang He Qi Shiqing Deng Lingzhi Cao Hui Liu Shuxian Hu Jun Chen 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing,People's Republic of China [2]Department of Physical Chemistry,University of Science and Technology Beijing,Beijing,People's Republic of China [3]School of Mathematics and Physics,University of Science and Technology Beijing,Beijing,People's Republic of China

出　　处：《InfoMat》2023年第1期114-124,共11页信息材料（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(grant nos.21825102,and 22075014);the Fundamental Research Funds for the Central Univer-sities,China(FRF-MP-20-40);National Postdoctoral Program for Innovative Talents(BX20200044,and BX20200043);the State Key Lab of Advanced Metals and Materials(2020-ZD01)。

摘　　要：Electrostrictive materials have wide applications in modern high-precision electronic devices.Driven by growing environmental concerns,there is demand for lead-free materials with superior electrostriction behaviors.In this study,we demonstrate a record-high electrostrictive coefficient of~0.0712 m^(4) C^(-2) in perovskite ferroelectric ceramics,along with hysteresis-free strain as well as excellent frequency and thermal stabilities,in lead-free BaTiO_(3)-based ceramics through a polarization nanocluster design.By appro-priately introducing Li+and Bi^(3+)into the BaTiO 3 lattice matrix,the long-range ferroelectric ordering can be broken,and polarization nanoclusters can be formed,resulting in a relaxor state with concurrently suppressed polariza-tion and maintained electro-strain.A three-dimensional atomic model constructed using advanced neutron total-scattering data combined with the reverse Monte Carlo method indicates the existence of Bi and Li segregations at the subnanometer scale,which confirms the prediction made by density functional theory calculations.Such a short-range chemical order destroys the long-range ferroelectric order of the off-centered Ti polar displacements and leads to the embedding of Li+/Bi ^(3+)-rich polar nanoregions in the Ba^(2+)-rich polarization disorder matrix.Further,a completely reversible electric-field-induced lattice strain is observed,giving rise to pure electrostriction without hysteresis behavior.This work provides a novel strategy for developing lead-free relaxor ferroelectrics with high electrostriction performance.

关 键 词：BaTiO_(3) electrostrictive effect local structure relaxor ferroelectrics 

分 类 号：TB383[一般工业技术—材料科学与工程]