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- Title
Structure and properties of (K<sub>0.5</sub>Na<sub>0.5</sub>)<sub>0.98</sub>Ag<sub>0.02</sub>Nb<sub>0.96</sub>Ta<sub>0.04</sub>O<sub>3</sub> piezoelectric ceramics doped by CuO.
- Authors
Yin, Qiyi; Wang, Chengze; Wang, Yu; Li, Shaobo; Zhang, Quanzheng; Yang, Jie; Tian, Changan
- Abstract
Low-temperature sintering technology can control the volatilization of sodium and potassium ions during high-temperature preparation to obtain excellent physical properties of ceramics. In this research, we used the traditional ceramic preparation technology. KNN-based lead-free piezoelectric ceramics were prepared for the first time at home and abroad by using CuO and Na2O as collective additives under low sintering temperature (1020 °C) conditions. X-ray diffraction, scanning electron microscopy, and other modern test analyses show that KNANTC ceramics can form a pure perovskite structure of tetragonal phase in the total research range when 0.01 mol Na2O is used as a supplement to the A position of KNN piezoelectric ceramics. A moderate amount of CuO doping can simultaneously enhance liquid-phase sintering, promote grain growth, improve the density of ceramics, and achieve excellent electrical properties. The test results of KNANTC piezoelectric ceramics show good electrical properties when x = 0.035, that is, d33 = 343 pC/N, kp = 49%, εr = 1382, tan δ = 1.1%, Pr = 24.9 µC/cm2, EC = 1.92 kV/mm, and Tc = 306 °C. These results indicate that KNANTC-x is a promising lead-free piezoelectric ceramic material that can gradually replace the traditional PZT-based piezoelectric ceramics in the future.
- Subjects
PIEZOELECTRIC ceramics; DOPING agents (Chemistry); COPPER oxide; POTASSIUM ions; SODIUM ions
- Publication
Journal of Materials Science: Materials in Electronics, 2018, Vol 29, Issue 11, p9268
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-018-8956-9