首页|Rare-earth praseodymium-substituted Bi5Ti3FeO15 exhibiting enhanced piezoelectric properties for high-temperature application
Rare-earth praseodymium-substituted Bi5Ti3FeO15 exhibiting enhanced piezoelectric properties for high-temperature application
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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.How-ever,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 opti-mization 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(Bi2O2)2+,thereby reducing the concentration of oxygen vacancies.Con-sequently,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 high-temperature piezoelectric sensor technologies.
Xin-Yu Yu、Qian Wang、Hui-Lin Li、Yi-Jun Wan、En-Meng Liang、Chun-Ming Wang
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School of Physics,State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China
Center for Optics Research and Engineering(CORE),Key Laboratory of Laser and Infrared System of Ministry of Education,Shandong University,Qingdao 266237,China
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