Effect of Li_2O and CuO additives on the structural and piezoelectric properties of (Na_0.5K_0.5)(Nb_0.96Sb_0.04)O_3 lead-free piezoelectric ceramics
Effect of Li_2O and CuO additives on the structural and piezoelectric properties of (Na_0.5K_0.5)(Nb_0.96Sb_0.04)O_3 lead-free piezoelectric ceramics
- 주제(키워드) Ceramics , Piezoelectricity , Electron energy loss spectroscopy (EELS) , Microstructure
- 발행기관 한국물리학회
- 발행년도 2011
- 총서유형 Journal
- UCI G704-001115.2011.11.3.077
- KCI ID ART001553446
- 본문언어 영어
초록/요약
[(Na_0.5K_0.5)_(1-x)Li_x](Nb_0.96Sb_0.04)O_3 [NKLNS100x] ceramics with 0.0 ≤ x ≤ 0.1 were sintered at 1040 ℃ 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 k_p = 0.43, d_33 = 243 pC/N and ε_33^T/ε_0 = 990. The [(Na_0.5K_0.5)_0.95Li_0.05](Nb_0.96Sb_0.04)O_3[NKLNS5] ceramics sintered at 960 ℃ also showed a high density by the addition of CuO, due to the production of the CuO and Na_2O-related liquid phase. The Cu^2＋ ions were considered to replace Nb^5＋ions and act as a hardener, which increased the Qm value of the NKLNS5 ceramics. High piezoelectric properties of k_p = 0.37, Q_m = 560, ε_33^T/ε_0 = 600 and d_33 = 170 pC/N were obtained from the specimen containing 1.5 mol% of CuO sintered at 960 ℃ for 2 h.
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