Preparation and properties of (K0.5Na0.5)NbO3-LiNbO3 ceramics
(1.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China2.Key Laboratory of Electronic Materials Research, Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China3.College of Science, Air Force Engineering University, Xi’an 710051, China)
Abstract: The lead-free piezoelectric ceramics (1？x)(K0.5Na0.5)NbO3-xLiNbO3(abbreviated as KNLN) were synthesized by a traditional solid state reaction. The effects of Li+ on the sintering characteristic, the phase structure and piezoelectric properties of KNLN ceramics were investigated. The sintering temperature of KNN-based ceramics is decreased by doping Li+ and the range of the sintering temperature is narrow. The KNLN ceramics exhibit an enhanced piezoelectric properties with the piezoelectric constant d33 value of 180？200 pC/N, The electromechanical coupling coefficients kp is 35%？40%. The results show that (1？x)(K0.5Na0.5)- NbO3-xLiNbO3 (x=0.05, 0.06) is a promising high-temperature lead free piezoelectric ceramic.
Key words: (K0.5Na0.5)NbO3-LiNbO3; lead-free piezoelectric ceramics; piezoelectric properties; perovskite