Journal
PHYSICA B-CONDENSED MATTER
Volume 405, Issue 7, Pages 1918-1921Publisher
ELSEVIER
DOI: 10.1016/j.physb.2010.01.074
Keywords
Oxide dopants; Piezoelectric ceramics; Structure; Electrical properties
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Funding
- Shanghai Leading Academic Disciplines [S30107]
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The alkaline niobate-based perovskite ceramics (K,Na,Li)(Nb,Sb)O-3 has been regarded as a new candidate of lead-free piezoelectric materials due to its excellent piezoelectric properties. In this study, 0.948(Na0.5K0.5)NbO3-0.052LiSbO(3) (KNN-LS) based ceramics were prepared by a conventional solid-state reaction method. The effects of ZnO, CuO and MnO2 on the structure, dielectric and piezoelectric properties of KNN-LS were investigated in this study. When 1 mol% oxide clopants were added, respectively, KNN-LS piezoelectric ceramics became hard. Mechanical quality factor Q value increased significantly with unobvious change of d(33) (93-119 pC/N). KNN-LS ceramics kept high Curie temperature Tc around 350 degrees C. Dielectric loss at 1 KHz decreased a lot to below 5%. The results show that the oxide-doped KNN-LS ceramics are promising lead-free piezoelectric materials for electromechanical transducer applications. (C) 2010 Elsevier B.V. All rights reserved.
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