Effect of CuO on the sintering temperature and piezoelectric properties of lead-free 0.95(Na0.5K0.5)NbO3-0.05CaTiO3 ceramics

Seok Jung Park, Hwi Yeol Park, Kyung Hoon Cho, Sahn Nahm, Hyeung Gyu Lee, Duk Hee Kim, Byung Hyun Choi

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57 Citations (Scopus)


The addition of a small amount of CuO to the 0.95(Na0.5K0.5)NbO3-0.05CaTiO3 (0.95NKN-0.05CT) ceramics sintered at 960 °C for 10 h produced a dense microstructure with large grains due to the liquid phase sintering. Due to the negligible Na2O evaporation, poling was easy for all specimens sintered at 960 °C. The piezoelectric properties of the specimens were considerably influenced by the relative density, grain size and liquid phase amount. The high piezoelectric properties of d33 = 200 pC/N, kp = 0.37, ε{lunate}3T / ε{lunate}0 = 1173 and Qm = 350 were obtained for the 0.95NKN-0.05CT ceramics containing 2.0 mol% CuO sintered at 960 °C for 10 h. Therefore, the 0.95NKN-0.05CT ceramics containing a small amount of CuO are a good candidate material for lead-free piezoelectric ceramics.

Original languageEnglish
Pages (from-to)3580-3586
Number of pages7
JournalMaterials Research Bulletin
Issue number12
Publication statusPublished - 2008 Dec 1


  • A. Ceramics
  • C. Electron microscopy
  • C. X-ray diffraction
  • D. Microstructure
  • D. Piezoelectricity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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