Rare-earth praseodymium-substituted Bi_(5)Ti_(3)FeO_(15) exhibiting enhanced piezoelectric properties for high-temperature application  

作　　者：Xin-Yu Yu Qian Wang Hui-Lin Li Yi-Jun Wan En-Meng Liang Chun-Ming Wang 

机构地区：[1]School of Physics,State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China [2]Center for Optics Research and Engineering(CORE),Key Laboratory of Laser and Infrared System of Ministry of Education,Shandong University,Qingdao 266237,China

出　　处：《ChemPhysMater》2024年第4期431-439,共9页化学物理材料（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52372115);the Opening Project of Key Laboratory of Inorganic Functional Materials and Devices,Chinese Academy of Sciences(Grant No.KLIFMD202309);Fundamental Research Funds for Central Universities.Dr.Q.W.also acknowledges financial support from the State Key Laboratory of Crystal Materials,Shandong University(Grant No.KF2308).

摘　　要：Owing to their exceptional piezoelectric effects,piezoelectric materials play a crucial role in high-end technologies and contribute significantly to the national economy.Bismuth layer-structured ferroelectrics(BLSFs)possess high Curie temperatures,making them a focal point of research in high-temperature piezoelectric sensor devices.However,their poor piezoelectric performance and low direct-current(DC)electrical resistivity hinder their effective deployment in high-temperature applications.To overcome these shortcomings,we employed composition optimization by partially substituting bismuth ions with rare-earth praseodymium ions.This approach enhances the piezoelectric performance and improves the DC electrical resistivity by preventing the loss of volatile bismuth ions and stabilizing the bismuth oxide layer(Bi_(2)O_(2))2+,thereby reducing the concentration of oxygen vacancies.Consequently,we achieved a large piezoelectric constant d33 of 23.5 pC/N in praseodymium-substituted Bi5Ti3FeO15,which is three times higher than that of pure Bi5Ti3FeO15(7.1 pC/N),along with a high Curie temperature TC of 778℃.Additionally,the optimal composition of 4 mol%praseodymium-substituted Bi5Ti3FeO15 exhibits good thermal stability of electromechanical coupling characteristics up to 300℃.This study holds promise for a wide array of high-temperature piezoelectric applications and has the potential to accelerate the development of hightemperature piezoelectric sensor technologies.

关 键 词：Bismuth layer-structured ferroelectrics(BLSFs) Bismuth titanate-ferrite(Bi5Ti3FeO15) High-temperature piezoelectric sensors Piezoelectric ceramics 

分 类 号：TQ174.1[化学工程—陶瓷工业]