An exploration for new strategy: Achieving both excellent temperature stability and good electrostrain in BiFeO3–BaTiO3-based relaxor ferroelectrics by domain engineering. (October 2022)

• Record Type: Journal Article
• Authors: Li, Chongyang; Xue, Haoyue; Zheng, Ting; Wu, Jiagang
• Is Part Of: Materials today physics. Volume 27(2022)
• Publication Date: 2022-10
• Subjects: BF-BT -- Electrostrain -- Temperature stability -- Nanodomain -- Relaxor ferroelectrics; Materials science -- Periodicals; Physics -- Periodicals; Electronic journals; 530.41
• DOI: 10.1016/j.mtphys.2022.100747
• Languages: English
• ISSNs: 2542-5293

Abstract

Abstract: In BiFeO3 - x BaTiO3 (BF- x BT) ceramic systems, some of them exhibit good electrostrain, unfortunately, their electrostrain properties always fluctuate with temperature. To obtain good strain performance with excellent temperature stability, the BiFeO3 –BaTiO3 - x Bi(Mg2/3 Nb1/3 )O3 (BF-0.4BT- x BMN) relaxor ferroelectrics were designed, and a new strategy of changing the temperature & electric field-dependent characteristics of nanodomains by doping was proposed for the first time. An excellent result ( S = 0.27% @80 °C, fluctuating degree≈2% during 80 °C–180 °C) was achieved, much better than previously reported results, presenting great potential in the application of high-temperature devices. Temperature-dependent dielectric permitivity combined with piezo-response force microscopic (PFM) techniques demonstrated that the doping of Bi(Mg2/3 Nb1/3 )O3 (BMN) decreased the high maximum-dielectric-constant temperature ( T m ) and freezing temperature ( T f ) as well as the proportion of nanodomains with strong piezo-response. What's more, the temperature-dependent dS/dE curves combined with in-situ synchrotron X-Ray diffraction measurements during electric field loading revealed the transformation from nanodomain into macrodomain (n-m). The introduction of BMN resulted in an increase of the nanodomain-macrodomain transition electric field at room temperature together with the decrease of domain switching at high temperature, both of which were the key to improving the temperature stability of strain. Graphical abstract: Image 1 Highlights: Proposing a new strategy for manipulating properties by adjusting the local piezo-response of the nanodomain. Realizing both large strain and excellent temperature stability in BF-0.4BT-0.01BMN relaxor ferroelectrics. Systematically analyzed the mechanism of nanodomain under E-field on strain using in-situ synchrotron X-Ray diffraction.