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- Title
Phase structure, dielectric, and piezoelectric properties of (K<sub>0.94− x</sub>Na<sub> x</sub>Li<sub>0.06</sub>)(Nb<sub>0.94</sub>Sb<sub>0.06</sub>)O<sub>3</sub> lead-free ceramics.
- Authors
Fu, Lingling; Lin, Dunmin; Zheng, Qiaoji; Wu, Xiaochun; Xu, Chenggang
- Abstract
Lead-free piezoelectric ceramics (K0.94− xNa xLi0.06)(Nb0.94Sb0.06)O3 have been fabricated by a conventional ceramic technique and the effects of K+/Na+ ratio on the structure and piezoelectric properties of the ceramics have been studied. All the ceramics possess a pure perovskite structure. The coexistence of tetragonal and orthorhombic phases is formed at room temperature in the ceramics with 0.45 ≤ x ≤ 0.55. The tetragonal-orthorhombic phase-transition temperature TO-T decreases from 110 to 54 °C with x increasing from 0.35 to 0.55 and then increases from 84 to 144 °C with x further increasing from 0.6 to 0.7, while the Curie temperature TC deceases from 388 to 348 °C with x increasing from 0.35 to 0.70. Because of the coexistence of the two phases near room temperature, the ceramics with x = 0.50 exhibit the optimum piezoelectric properties: d33 = 230 pC/N and kp = 49%. The ceramics possess good time stability of piezoelectric properties.
- Publication
Physica Status Solidi. A: Applications & Materials Science, 2012, Vol 209, Issue 11, p2299
- ISSN
1862-6300
- Publication type
Article
- DOI
10.1002/pssa.201228406