Yang Shuai, Li Jinglei, Liu Yao, Wang Mingwen, Qiao Liao, Gao Xiangyu, Chang Yunfei, Du Hongliang, Xu Zhuo, Zhang Shujun, Li Fei
Electronic Materials Research Laboratory (Key Lab of Education Ministry), State Key Laboratory for Mechanical Behavior of Materials and School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, China.
Condensed Matter Science and Technology Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, China.
Nat Commun. 2021 Mar 3;12(1):1414. doi: 10.1038/s41467-021-21673-8.
The figure-of-merits of ferroelectrics for transducer applications are their electromechanical coupling factor and the operable temperature range. Relaxor-PbTiO ferroelectric crystals show a much improved electromechanical coupling factor k (8893%) compared to their ceramic counterparts (6578%) by taking advantage of the strong anisotropy of crystals. However, only a few relaxor-PbTiO systems, for example Pb(InNb)O-Pb(MgNb)O-PbTiO, can be grown into single crystals, whose operable temperature range is limited by their rhombohedral-tetragonal phase transition temperatures (T: 60120 °C). Here, we develop a templated grain-growth approach to fabricate <001>-textured Pb(InNb)O-Pb(ScNb)O-PbTiO (PIN-PSN-PT) ceramics that contain a large amount of the refractory component ScO, which has the ability to increase the T of the system. The high k of 8589% and the greatly increased T of 160~200 °C are simultaneously achieved in the textured PIN-PSN-PT ceramics. The above merits will make textured PIN-PSN-PT ceramics an alternative to single crystals, benefiting the development of numerous advanced piezoelectric devices.
用于换能器应用的铁电体的品质因数是其机电耦合系数和可工作温度范围。弛豫型钛酸铅铁电晶体通过利用晶体的强各向异性，与陶瓷对应物（65%78%）相比，其机电耦合系数k有了显著提高（88%93%）。然而，只有少数弛豫型钛酸铅体系，例如铟铌酸铅-镁铌酸铅-钛酸铅，能够生长成单晶，其可工作温度范围受其菱方-四方相变温度（T：60120 °C）限制。在此，我们开发了一种模板晶粒生长方法来制备<001>织构化的铟铌酸铅-钪铌酸铅-钛酸铅（PIN-PSN-PT）陶瓷，该陶瓷含有大量难熔成分氧化钪，它有能力提高体系的T。在织构化的PIN-PSN-PT陶瓷中同时实现了85%89%的高k和160~200 °C的大幅提高的T。上述优点将使织构化的PIN-PSN-PT陶瓷成为单晶的替代品，有利于众多先进压电器件的发展。
Zotero 插件