Enhanced piezoelectricity in 0.7BiFeO_(3)-0.3BaTiO_(3)lead-free ceramics:Distinct effect of poling engineering  

作　　者：Aizhen Song Yu-Cheng Tang Hezhang Li Ning Wang Lei Zhao Jun Pei Bo-Ping Zhang 

机构地区：[1]The Beijing Municipal Key Laboratory of New Energy Materials and Technologies,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100083,China [2]Department of Precision Instrument,Tsinghua University,Beijing,10084,China [3]Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province,College of Physics Science and Technology,Hebei University,Baoding,071002,China

出　　处：《Journal of Materiomics》2023年第5期971-979,共9页无机材料学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(52072028 and 52032007);the National Key Research and Development Program(2022YFB3807400).

摘　　要：BiFeO_(3)-BaTiO_(3) based ceramics are considered to be the most promising lead-free piezoelectric ceramics due to their large piezoelectric response and high Curie temperature.Since the piezoelectric response of piezoelectric ceramics just appears after poling engineering,in this work,the domain evolution and microscopic piezoresponse were observed in-situ using piezoresponse force microscopy(PFM)and switching spectroscopy piezoresponse force microscopy(SS-PFM),which can effectively study the local switching characteristics of ferroelectric materials especially at the nanoscale.The new domain nucleation preferentially forms at the boundary of the relative polarization region and expands laterally with the increase of bias voltage and temperature.The maximum piezoresponse(Rs),remnant piezoresponse(Rrem),maximum displacement(Dmax)and negative displacement(Dneg)at 45 V and 120C reach 122,69,127 pm and 75 pm,respectively.Due to the distinct effect of poling engineering in full domain switching,the corresponding d33 at 50 kV/cm and 120C reaches a maximum of 205 pC/N,which is nearly twice as high as that at room temperature.Studying the evolution of ferroelectric domains in the poling engineering of BiFeO_(3)-BaTiO_(3)ceramics provides an insight into the relationship between domain structure and piezoelectric response,which has implications for other piezoelectric ceramics as well.

关 键 词：0.7BiFeO_(3)-0.3BaTiO_(3) Domain evolution Microscopic piezoresponse Poling engineering PIEZOELECTRICITY 

分 类 号：TQ174.75[化学工程—陶瓷工业]