Effect of Li2O on the defect polarization in CuO-added (K0.9Na0.1)NbO3 piezoelectric ceramics

Dae Hyeon Kim, Jongseong Park, Tae Gon Lee, Sung Hoon Cho, Su Jin Park, Ku Tak Lee, Jong Hyun Kim, Sahn Nahm

Research output: Contribution to journalArticlepeer-review


CuO-added (LixK0.9−xNa0.1)NbO3 [C(LxK0.9−xN0.1)N] ceramics with 0.0≤x≤0.05 were well-sintered at 960°C for 6 hours. The lattice parameters of the specimens decreased with the addition of Li2O. Defect polarization (PD) formed between Cu2+ions and oxygen vacancies. Double polarization vs electric field (P-E) hysteresis and sprout-shaped strain vs electric field (S-E) curves were observed in these specimens with a large strain of 0.16% at 7.0 kV/mm, possibly owing to the presence of PD. When the P-E curve was measured at temperatures higher than 75°C, the C(K0.9N0.1)N ceramic exhibited a normal P-E hysteresis curve, whereas the C(L0.04K0.86N0.1)N ceramic maintained the double P-E hysteresis curve up to 125°C, indicating that Li2O increased the thermal stability of PD. The latter specimen also showed the sprout shaped S-E curve with a strain of 0.15% at 7.0 kV/mm after 104 cycles of a high electric field of 7.0 kV/mm.

Original languageEnglish
Pages (from-to)5193-5201
Number of pages9
JournalJournal of the American Ceramic Society
Issue number11
Publication statusPublished - 2017 Nov


  • lead-free ceramics
  • low temperature
  • piezoelectric materials/properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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