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

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InfoMat 2023年第1期5卷 114-124页

作者： Lu Wang He Qi Shiqing Deng Lingzhi Cao Hui Liu Shuxian Hu Jun Chen Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijingPeople's Republic of China Department of Physical Chemistry University of Science and Technology BeijingBeijingPeople's Republic of China School of Mathematics and Physics University of Science and Technology BeijingBeijingPeople's Republic of China

electrostrictive materials have wide applications in modern high-precision electronic *** by growing environmental concerns,there is demand for lead-free materials with superior electrostriction *** 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 *** 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 *** 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 ***,a completely reversible electric-field-induced lattice strain is observed,giving rise to pure electrostriction without hysteresis *** 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

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