Giant strain response with low hysteresis in potassium sodium niobate based lead-free ceramics |
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| Affiliation: | 1. The State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), China;3. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, China;1. School of Materials Science and Engineering, University of Science and Technology Beijing, 100083 Beijing, China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084 Beijing, China;1. Department of Nano Bio Information Technology, KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea;2. Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea;3. School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea;4. Electronic Materials and Device Research Center, Korea Electronics Technology Institute, Seongnam, Gyeonggi-do, South Korea;5. Center for Electronic Materials, Korea Institute of Science and Technology (KIST), Seoul, 02791, Republic of Korea;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;2. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, PR China;3. Department of Materials Science, Sichuan University, Chengdu, 610064, PR China |
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| Abstract: | In this work, the relationships between the composition-driven phase boundary, ferroelectricity and strain properties of the (1-x)(K0.48Na0.52)(Nb1-ySby)O3-xBi0.5(Na0.82K0.18)0.5ZrO3 (abbreviated as (1-x)KNN1-ySy-xBNKZ) ceramics were investigated. A giant electric field-induced strain of 0.3% (d331 = 750 p.m./V) and a low hysteresis (16.4%) were obtained in the 0.97KNN0.98S0.02-0.03BNKZ ceramics. The giant strain is attributed to the enhanced piezoelectricity induced by the appearance of the O-T phase boundary and the electric-field-induced phase transition from the relaxor phase to the ferroelectric phase. Furthermore, the 0.97KNN0.98S0.02-0.03BNKZ ceramics exhibit good thermal stability in the temperature range from 25 °C to 150 °C. Hence, this work can promote the practical applications of KNN-based lead-free piezoelectric ceramics in highly sensitive and precise piezoelectric actuators. |
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| Keywords: | Potassium-sodium niobate Giant strain Low hysteresis Thermal stability |
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