Enhanced piezoelectric property and promoted depolarization temperature in Fe doped Bi1/2(Na0.8K0.2)1/2TiO3 lead-free ceramics |
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| Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, PR China;2. College of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000, PR China;1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China;1. School of Material Science and Engineering, Central South University, Changsha, Hunan 410083, PR China;2. School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi 541004, PR China;1. College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, People’s Republic of China;2. The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science,Shanghai 200050, People’s Republic of China;1. Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology Lanna (RMUTL), Chiang Mai 50300, Thailand;2. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;3. School of Physics, Institute of Science, and NANOTEC-SUT Center of Excellence on Functional Nanomaterials, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;4. Materials Science, School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, Corvallis, OR 97331, USA |
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| Abstract: | Piezoelectric sensors and energy harvesters require piezoelectric materials with large piezoelectric responses and good thermal stability. However, a commonly accepted concept is that the promotion of depolarization temperature of Bi1/2Na1/2TiO3-based lead-free ceramics is usually companied by deterioration of piezoelectric properties. In the present study, the effects of acceptor-Fe doping on piezoelectric property and thermal depolarization behavior of Bi1/2(Na0.8K0.2)1/2TiO3 ceramics are investigated. Fe doping at an appropriate level (≤ 3.0%) improves piezoelectric property and thermal stability simultaneously, due to the stabilization of long-range ferroelectric order. Piezoelectric constant d33 increases from 125 pC/N to 148 pC/N with Fe amount of 3.0%, and then decreases. The depolarization temperature Td is promoted continuously with Fe addition, from 76 °C for the undoped sample to 118 °C for the sample with Fe amount of 5.0%. It is proposed that the piezoelectric property and thermal stability can be simultaneously improved by stabilizing the long-range ferroelectric order in Bi1/2Na1/2TiO3-based systems with obvious relaxor character. This work provides a new insight into the improvement of Bi1/2Na1/2TiO3-based lead-free piezoelectric ceramics. |
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| Keywords: | Lead-free piezoceramics Potassium sodium bismuth titanate Piezoelectric property Depolarization temperature |
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