High performance lead-free Na0.5K0.5NbO3 piezoelectric ceramics obtained via oscillatory hot-pressing |
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| Affiliation: | 1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China;2. Bruker (Beijing) Scientific Technology Co., Ltd, Shanghai, 200233, China;3. Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China;1. Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi’an, 710062, Shaanxi, PR China;2. School of Chemistry and Chemical Engineering, Yulin University, Yulin, 719000, Shaanxi, PR China;3. College of Physics and Information Technology, Shaanxi Normal University, Xi''an, 710062, Shaanxi, PR China;4. Department of Basic Sciences, Air Force Engineering University, Xi''an, 710051, Shaanxi, PR China;5. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi''an, 710021, Shaanxi, PR China;1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, 710072, PR China;2. Science and Technology on Plasma Dynamics Lab, Air Force Engineering University, Xi''an, 710038, PR China |
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| Abstract: | Lead-free Na0.5K0.5NbO3 (KNN) piezoelectric ceramics is regarded as a potential candidate for PZT material, while high performance is difficult to be obtained due to its poor sinterability and non-stoichiometric component. In this work, oscillatory pressure-assisted hot pressing (OPAHP) is utilized to fabricate KNN ceramics with high density. The KNN ceramics sintered at 860 °C exhibits superior performance with piezoelectric parameter (d33) of 142 pC/N, electromechanical coupling factors (kp) of 0.41, and relative permittivity (εT33/ε0) of 472–620. Additionally, hardness and flexural strength are measured as 3.55 GPa and 99.13 MPa, respectively. This work indicates that OPAHP technique is effective for fabricating KNN piezoelectric ceramics with high performance. |
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| Keywords: | Sintering Grain size Niobates Perovskites |
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