The high nano-domain improves the piezoelectric properties of KNN lead-free piezo-ceramics |
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| Affiliation: | 1. Institute of Aeronautics and Space, São José dos Campos, SP, 12228-904, Brazil;2. Institute for Advanced Studies, São José dos Campos, SP, 12228-001, Brazil;1. University of Electronic Science and Technology of China, School of Optoelectronic Science and Engineering, Chengdu, 610054, PR China;2. North University of China, School of Information and Communication Engineering, Taiyuan, 030000, PR China;3. SensView Technology (Chengdu) Co., Ltd., Chengdu, 610054, PR China;4. University of Electronic Science and Technology of China, School of Electronic Science and Engineering, Chengdu, 610054, PR China;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. Guangdong Provincial Key Laboratory of Minimally Invasive Surgical Instruments and Manufacturing Technology, Guangdong University of Technology, Guangzhou, 510006, China;3. State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming, 650106, China |
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| Abstract: | Due to their high Curie temperature and large dielectric constant, potassium sodium niobate-based lead-free piezo-ceramics (KNN) are regarded as one of the most hopeful piezo-ceramics candidate materials. Herein, (1-x) (K0.5Na0.5)(Nb0.96Sb0.04)O3 - x (Ba0.5Sr0.25)ZrO3 abbreviated as (1-x) KNNS - x BSZ, x = 0, 0.01, 0.02, 0.03, 0.04 and 0.05] lead-free piezo-ceramics are prepared through chemical doping using the traditional solid phase method. The phase structure, domain structure, and microstructure of KNN ceramics have been thoroughly examined. Doping of BZS causes the formation of R-O-T phase boundaries and increases the proportion of polar nano-domains within the crystals, thus increasing the rate of motion of the domain walls and making the domains more easily deflected. The piezoelectric and dielectric properties of the material are improved simultaneously. When x = 0.04, the piezoelectric properties of ceramics reach the optimal value (d33 = 351 pC/N, TC = 305 °C, Kp = 43% and εr = 41267). This work offers a fresh concept for enhancing the overall performance of lead-free piezo-ceramics and aids in understanding the nature of doping modification of lead-free piezo-ceramics. |
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| Keywords: | KNN ceramics Polar nano-domain Multi-phase coexistence Ferroelectric property |
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