Domain Evolution and Piezoelectric Response across Thermotropic Phase Boundary in (K,Na)NbO3-Based Epitaxial Thin Films
Luo, Jin1; Sun, Wei1; Zhou, Zhen1; Bai, Yu2; Wang, Zhan Jie2; Tian, Guo3; Chen, Deyang3; Gao, Xingsen3; Zhu, Fangyuan4; Li, Jing-Feng1
Source PublicationACS Applied Materials and Interfaces
AbstractRecent research progress in (K,Na)NbO3(KNN)-based lead-free piezoelectric ceramics has attracted increasing attention for their applications to microsystems or microelectromechanical systems (MEMS) in the form of thin films. This work demonstrates that high-quality KNN-based epitaxial films can be synthesized by a conventional sol-gel method, whose phase structure and domain characteristics have been investigated with emphasis on the temperature effect. A monoclinic MCstructure is observed at room temperature in KNN-based epitaxial films, which is close to but different from the orthorhombic phase in bulk counterparts. Piezoresponse force microscopy (PFM) at elevated temperatures reveals continuous changes of ferroelectric domains in KNN films during heating and cooling cycles between room temperature and 190 °C. A distinct change in domain morphology is observed upon heating to 110 °C, accompanied by a clear variation of dielectric permittivity suggesting a thermotropic phase transition, which is revealed to belong to a MC-MAphase transition on the basis of structural and PFM analysis on local ferroelectric and piezoelectric behaviors. Enhanced piezoelectric response at the thermotropic phase boundary is observed, which is attributed to active domains and/or nanodomains formed across the boundary. Domain engineering by utilizing the phase transition should be important and effective in KNN-based films not only for property enhancement but also for its textured ceramics. © 2017 American Chemical Society.
EI Accession Number20171703594423
EI KeywordsFerroelectric films
EI Classification Number701.1 Electricity: Basic Concepts and Phenomena - 704.2 Electric Equipment - 708.1 Dielectric Materials - 801 Chemistry - 801.4 Physical Chemistry - 804 Chemical Products Generally - 812.1 Ceramics - 812.3 Glass - 933 Solid State Physics
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Document Type期刊论文
Affiliation1.State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing; 100084, China;
2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang; 110016, China;
3.Institute for Advanced Materials, Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou; 510006, China;
4.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, No. 239 Zhangheng Road, Pu-dong District, Shanghai; 201204, China
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GB/T 7714
Luo, Jin,Sun, Wei,Zhou, Zhen,et al. Domain Evolution and Piezoelectric Response across Thermotropic Phase Boundary in (K,Na)NbO3-Based Epitaxial Thin Films[J]. ACS Applied Materials and Interfaces,2017,9(15):13315-13322.
APA Luo, Jin.,Sun, Wei.,Zhou, Zhen.,Bai, Yu.,Wang, Zhan Jie.,...&Li, Jing-Feng.(2017).Domain Evolution and Piezoelectric Response across Thermotropic Phase Boundary in (K,Na)NbO3-Based Epitaxial Thin Films.ACS Applied Materials and Interfaces,9(15),13315-13322.
MLA Luo, Jin,et al."Domain Evolution and Piezoelectric Response across Thermotropic Phase Boundary in (K,Na)NbO3-Based Epitaxial Thin Films".ACS Applied Materials and Interfaces 9.15(2017):13315-13322.
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