Structure and properties of (K0.5Na0.5)0.98Ag0.02Nb0.96Ta0.04O3 piezoelectric ceramics doped by CuO
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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.
This work is supported by the Natural Science Foundation of Anhui Province (No. 1708085ME112), the Natural Science Foundation of the Education Department of Anhui Province (Nos. KJ2017A533, KJ2017A535, and KJ2015B1105906), the College Students Maker Laboratory Construction Plan of Anhui Province (No. 2016ckjh161), the Talent Research Foundation of Hefei University (No. 16-17RC09), the Outstanding Youth Talent Foundation of Hefei University (Nos. 16YQ04RC and 16YQ05RC), and the College Students’ Innovation and Entrepreneurship Training Program (Nos. 201611059029, 201611059030, 201611059085, 201611059088, 201611059096, 201611059102, 201611059107, 201611059119, 201611059120, and 201611059122).