Na_(1-x)K_xNbO_3(x=0.2~0.8) Lead-Free Piezoelectric Ceramics Prepared by Spark Plasma Sintering

摘要

Highly dense Na_(1-x)K_xNbO_3 (x=0.2~0.8) ceramics were successfully prepared using spark plasma sintering (SPS) at temperature as low as 920 deg C. Solid solutions were formed during the composition range investigated. The piezoelectric constant and planar mode electromechanical coupling coefficient are significantly dependent on the Na/K ratio, with the maximum value of 148 pC/N and 38.9 percent at the composition Na_(0.5)K_(0.5)NbO_3.