Effect of Li2O and CuO additives on the structural and piezoelectric properties of (Na0.5K0.5)(Nb 0.96Sb0.04)O3 lead-free piezoelectric ceramics

Min Kyu Choi, Hwi Yeol Park, In Tae Seo, Jae Hong Choi, Woong Kim, Sahn Nahm, Hwack Joo Lee

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


[(Na0.5K0.5)1-xLix](Nb 0.96Sb0.04)O3 [NKLNS100x] ceramics with 0.0 ≤ x ≤ 0.1 were sintered at 1040 °C for 2 h and the specimens with x ≥ 0.05 had a dense microstructure due to liquid phase sintering. The specimen with x = 0.05 had both orthorhombic and tetragonal phases, and showed good piezoelectric properties of kp = 0.43, d33 = 243 pC/N and ε33T0 = 990. The [(Na 0.5K0.5)0.95Li0.05](Nb 0.96Sb0.04)O3 [NKLNS5] ceramics sintered at 960 °C also showed a high density by the addition of CuO, due to the production of the CuO and Na2O-related liquid phase. The Cu2+ ions were considered to replace Nb5+ ions and act as a hardener, which increased the Qm value of the NKLNS5 ceramics. High piezoelectric properties of kp = 0.37, Qm = 560, ε 33T0 = 600 and d33 = 170 pC/N were obtained from the specimen containing 1.5 mol% of CuO sintered at 960 °C for 2 h.

Original languageEnglish
Pages (from-to)598-603
Number of pages6
JournalCurrent Applied Physics
Issue number3
Publication statusPublished - 2011 May


  • Ceramics
  • Electron energy loss spectroscopy (EELS)
  • Microstructure
  • Piezoelectricity

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)


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