Stable self-polarization in lead-free Bi(Fe_(0.93)Mn_(0.05)Ti_(0.02))O_(3)thick films  

作　　者：Mengjia Fan Xinyu Bu Wenxuan Wang Wei Sun Xiujuan Lin Shifeng Huang Changhong Yang 

机构地区：[1]Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of Jinan,Jinan 250022,P.R.China

出　　处：《Journal of Advanced Dielectrics》2022年第6期48-55,共8页先进电介质学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51972144,U1806221 and U2006218);the Shandong Provincial Natural Science Foundation(Grant No.ZR2020KA003);the Project of“20 Items of University”of Jinan(Grant Nos.T202009 and T201907);the Introduction Program of Senior Foreign Experts(G2021024003L);the Shandong Provincial Key Research and Development Plan(Grant No.2022CXPT045).

摘　　要：The BiFeO3-based film is one of the most promising candidates for lead-free piezoelectric film devices.In this work,the 1μm-thick Bi(Fe_(0.93)Mn_(0.05)Ti_(0.02))O_(3)(BFMT)films are grown on the ITO/glass substrate using a sol-gel method combined with spin-coating and layer-by-layer annealing technique.These films display a large saturated polarization of 95μC/cm^(2),and a remanent polarization of 70μC/cm^(2).Especially,the films are self-poled caused by an internal bias field,giving rise to asymmetric polarization-electric field(P-E)loops with a positive shift along the x-axis.A stable self-polarization state is maintained during the applied electric field increasing to 1500 kV/cm and then decreasing back.The weak dependence of P-E loops on frequency(1-50 kHz)and temperature(25-125°C)indicate that the internal bias field can be stable within a certain frequency and temperature range.These results demonstrate that the self-polarized BFMT thick films can be integrated into devices without any poling process,with promising applications in micro-electro-mechanical systems.

关 键 词：LEAD-FREE stable self-polarization bismuth ferrite thick films. 

分 类 号：TB43[一般工业技术]