Piezoelectric properties of (Na1−xKx)NbO3-based lead-free piezoelectric ceramics and their application in knocking sensor

Dae Hyeon Kim, Tae Gon Lee, Sung Hoon Cho, Ku Tak Lee, Chong-Yun Kang, Won Kyoung Lee, Chung Kook Lee, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)5367-5373
Number of pages7
JournalJournal of the American Ceramic Society
Issue number12
Publication statusPublished - 2017 Dec 1


  • lead-free ceramics
  • piezoelectric materials/properties
  • sensors

ASJC Scopus subject areas

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

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