Investigations of domain switching and lattice strains in (Na,K)NbO3-based lead-free ceramics across orthorhombic-tetragonal phase boundary |
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| Affiliation: | 1. Institute of Electro Ceramics & Devices, School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, PR China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China;2. Institute of Acoustics, Chinese Academy of Sciences, No.21 North 4th Ring Road, Haidian District, 100190, Beijing, China;1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, 710072, PR China;2. Science and Technology on Plasma Dynamics Lab, Air Force Engineering University, Xi''an, 710038, PR China;1. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, PR China;2. Department of Materials Science and Engineering, Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, FL 32816, USA;1. Department of Materials Science, University of Erlangen-Nürnberg, Erlangen 91058, Germany;2. Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway;3. School of Materials Science and Engineering, UNSW Sydney, New South Wales 2052, Australia;4. Technische Universität Darmstadt, Anion Chemistry of Perovskite Type Materials, Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany;5. Karlsruher Insitut für Technologie, Institut für Nanotechnologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;6. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;1. School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA;2. Institute of Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany;3. Mechanical, Materials & Aerospace Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA |
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| Abstract: | Various strain contributions of (Na0.52K0.48 − x)(Nb0.92 − xSb0.08)O3− xLiTaO3 ceramics in the proximity of orthorhombic (O) and tetragonal (T) polymorphic phase boundary (PPB) were quantitatively resolved by means of synchrotron x-ray diffraction together with macroscopic strain measurements. Compared with O-rich compositions with a governing mechanism of intrinsic lattice strains, T-rich compositions exhibited a dominant strain mechanism from reversible domain switching. Quantitative analysis of diffraction data suggested that extrinsic strain contributions should depend on not only the lattice distortion δ, but also the poling texture Δf, phase content (for PPB compositions) and domain types. Smaller lattice distortion and higher poling texture tended to enhance the number of irreversible domain switching in O-rich compositions, thus leading to larger fraction of intrinsic lattice strain contribution. The calculated results demonstrated that the product of two parameters Δf and δ would give a reliable estimation of domain-switching strains for T-phase compositions but an overestimation for O-phase compositions. |
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| Keywords: | Piezoelectricity Strain X-ray diffraction Domain switching |
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