Lead-free electrostrictive bismuth perovskite ceramics with thermally stable field-induced strains |
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| Authors: | Vu Diem Ngoc Tran Hyoung-Su Han Chang-Ho Yoon Jae-Shin Lee Wook Jo Jürgen Rödel |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea;2. Institute of Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany;1. Institute of Materials Science, Technische Universität Darmstadt, Petersenstraße 23, 64287 Darmstadt, Germany;2. Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA;1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, PR China;2. Tsinghua University, Beijing, PR China;3. Zhejiang University, Hangzhou, PR China;4. Ulsan National Institute of Science and Technology, Republic of Korea;1. School of Materials Science and Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea;2. School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet Road, Ha Noi, Viet Nam;3. Department of Physics, Incheon National University, Incheon 406-772, Republic of Korea;1. Institute of Materials Science, Technische Universität Darmstadt, Petersenstraße 23, 64287 Darmstadt, Germany;2. Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA;1. School of Materials Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea;2. School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, 50 UNIST-gil, Ulju-gun, Ulsan 44919, Republic of Korea;3. School of Materials Science and Engineering, University of Ulsan, Daehak-ro 93, Ulsan 44610, Republic of Korea;1. Battery Research Center, Korea Electrotechnology Research Institute, Changwon, Republic of Korea;2. Department of Electrical Functionality Material Engineering, Korea University of Science and Technology, Daejeon, Republic of Korea |
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| Abstract: | Electric field-induced strain (EFIS) properties of Bi1/2(Na0.82K0.18)1/2TiO3 (BNKT) ceramics modified with Sr(K1/4Nb3/4)O3 (SKN) have been investigated as functions of composition and temperature. BNKT ceramics near a phase boundary revealed the coexistence of ferroelectric rhombohedral and tetragonal phases, resulting in a typical ferroelectric butterfly-shaped bipolar S–E loop at room temperature, whose normalized strain (Smax/Emax) showed a significant temperature coefficient of 0.38 pm/V/K. However, 5 mol% SKN-modified BNKT ceramics revealed a typical electrostrictive behaviour with a thermally stable electrostrictive coefficient, Q33 = 0.021 m4/C2, which is almost comparable to that of Pb(Mg1/3Nb2/3)O3 (PMN) ceramics that have been dominantly used as Pb-based electrostrictive materials over the last decades. |
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