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- Title
Microstructure and piezoelectric properties of NaF-doped K<sub>0.5</sub>Na<sub>0.5</sub>Nb<sub>0.95</sub>Ta<sub>0.5</sub>O<sub>3</sub> lead-free ceramics.
- Authors
Li, Huan; Gong, Dewei; Yang, Wenlong; Zhou, Zhongxiang
- Abstract
The effects of NaF on the microstructure and electrical properties of K0.5Na0.5Nb0.95Ta0.5 lead-free ceramics prepared by conventional sintering method were investigated in this study. The dopant NaF effectively lowers the sintering temperature and promotes the grain growth. Samples with a high relative density up to 96.3 % are achieved by adding 0.6 wt% NaF to improve the sinterability. The electric properties are also enhanced, and the optimum properties are achieved at the doping content of 1.0 wt% (d33 = 153 pC/N, kp = 32.2 %, Qm = 80.5, Ec = 0.89 kV/mm, and Pr = 16.5 μC/cm). The improvement of ferroelectric and piezoelectric properties is suggested to be largely contributed to the compensation of sodium element from dopant NaF for the volatilization of A-site alkali elements.
- Subjects
ELECTRIC properties of piezoelectric ceramics; MICROSTRUCTURE; SODIUM fluoride; LEAD-free ceramics; SINTERING; FERROELECTRIC ceramics testing; ALKALIES
- Publication
Journal of Materials Science, 2013, Vol 48, Issue 3, p1396
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-012-6887-z