Piezoelectric properties of (Na1−x K x )NbO3 -based lead-free piezoelectric ceramics and their application in knocking sensor
| Autor: | Tae Gon Lee, Chung Kook Lee, Chong Yun Kang, Sung Hoon Cho, Won Kyoung Lee, Dae Hyeon Kim, Ku Tak Lee, Sahn Nahm |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Piezoelectricity visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Figure of merit Ceramic Composite material 0210 nano-technology |
| Zdroj: | Journal of the American Ceramic Society. 100:5367-5373 |
| ISSN: | 0002-7820 |
| DOI: | 10.1111/jace.15107 |
| Popis: | Piezoelectric knocking sensors with a dense microstructure were fabricated at 960°C for 2 hours using various CuO-added (Na0.5K0.5)NbO3 (NKN)-based piezoelectric ceramics. The practical sensitivity (SP) of the knocking sensor, which is the ability to detect the knocking of a car engine, was influenced by the g33 × kp value of the piezoelectric ceramics, indicating that the g33 × kp can be considered a figure of merit of the piezoelectric ceramics used in the knocking sensor. The knocking sensor synthesized using the CuO-added 0.95(Na0.5K0.5)(Nb0.95Sb0.05)O3–0.05CaTiO3 (CNKNS–CT) ceramic, which showed a g33 of 25.7 Vm/N and kp of 0.46, exhibited a high SP of 119 mV/g at the resonance frequency. The SP of the commercial knocking sensor, which was synthesized using the Pb(Zr,Ti)O3 (PZT)-based ceramic, was 112 mV/g at the resonance frequency. Hence, the knocking sensor fabricated using the CNKNS–CT piezoelectric ceramic can be used to replace the commercial PZT-based knocking sensor. |
| Databáze: | OpenAIRE |
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