Phase-composition dependent domain responses in (K0.5Na0.5)NbO3-based piezoceramics |
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| Affiliation: | 1. Department of Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA;2. Institution for Superconducting and Electronic Materials, Australia Institute of Innovation Materials, University of Wollongong, Wollongong, NSW, 2500, Australia;1. Opto-electronics Materials & Devices Research Center, Korea Institute of Science & Technology (KIST), Seoul, 02792, Republic of Korea;2. Dept. of Nanomaterials Science & Technology, University of Science & Technology (UST), Daejeon, 34113, Republic of Korea;1. Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices, Guilin University of Technology, Guilin, 541004, China;2. Materials Research Institute, Pennsylvania State University, University Park, State College, PA, 168001, USA;3. Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales, NSW 2500, Australia;4. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an, 710049, China;5. Thin Film and Optical Manufacturing Technology Laboratory, Key Laboratory of Ministry of Education, Xi’an Technological University, Xi’an 710032, China;1. School of Advanced Materials and Nanotechnology, Xidian University, Xi''an 710071, China;2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi''an Jiaotong University, Xi''an 710049, China |
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| Abstract: | Lead-free (K0.5Na0.5)NbO3-based (KNN) piezoceramics featuring a polymorphic phase boundary (PPB) between the orthorhombic and tetragonal phases at room temperature are reported to possess high piezoelectric properties but with inferior cycling stability, while the ceramics with a single tetragonal phase show improved cycling stability but with lower piezoelectric coefficients. In this work, electric biasing in-situ transmission electron microscopy (TEM) study is conducted on two KNN-based compositions, which are respectively at and off PPB. Our observations reveal the distinctive domain responses in these two ceramics under cyclic fields. The higher domain wall density in the poled KNN at PPB contributes to the high piezoelectric properties. Upon cycling, however, a new microstructure feature, “domain intersection”, is directly observed in this PPB composition. In comparison, the off-PPB KNN ceramic develops large domains during poling, which experience much less extent of disruption during cycling. Our comparative study provides the basis for understanding the relation between phase composition and piezoelectric performance. |
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| Keywords: | Piezoelectric Fatigue Phase transition Polymorphic phase boundary Transmission electron microscopy |
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