Dice-and-fill processing and characterization of microscale and high-aspect-ratio (K,Na)NbO3-based 1–3 lead-free piezoelectric composites |
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| Affiliation: | 1. Pakistan Institute of Engineering and Applied Sciences, Islamabad 45650, Pakistan;2. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;1. Division of Physics, Faculty of Science and Agricultural Technology, Rajamangala University of Technology Lanna, Chiang Mai 50300, Thailand;2. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People''s Republic of China;2. Aerospace Research Institute of Material & Processing Technology, Beijing 100076, People''s Republic of China;1. School of Physical Science and Technology, Xinjiang University, Urumqi 830046, People''s Republic of China;2. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People''s Republic of China;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, China;3. Fenghua Advanced Technology Holding Co., Ltd, Zhaoqing 526000, China |
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| Abstract: | Piezoelectric composites with high-aspect-ratio lead-free piezoelectric microrods embedded in a polymer matrix were fabricated by applying the modified dice-and-fill method to a (K,Na)NbO3-based piezoelectric ceramic, 0.9475Li0.02(K0.48Na0.53)0.98](Nb0.80Ta0.20)O3–0.0525AgSbO3–0.5 wt% MnO2 (abbreviated as LKNNT–AS–M) with enhanced piezoelectricity but low mechanical strength. The Pb-free LKNNT–AS–M/polymer composite specimens containing ∼10–23 vol% ceramic pillars with sectional width ∼50 μm, separation ∼55–110 μm and high aspect ratio ∼11, were prepared and investigated with an emphasis on their electrical properties. The developed composites possess a higher thickness factor kt ∼63–67%, lower planar factor kp ∼27–34% and enhanced kt/kp ratio ∼2.3. The composites also possess favorable properties which includes low electrical (tanδ ∼0.029) and mechanical (Qm ∼6) losses, low acoustic impedance Z ∼4.2–7.8 Mrayl and ∼5 times higher voltage coefficient g33 compared to LKNNT–AS–M piezoceramic. The promising results indicate that the LKNNT–AS–M/polymer composites have the potential to be used as active elements in high performance ultrasonic transducers. |
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| Keywords: | Piezoelectric 1–3 Composites Lead-free KNN |
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