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°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 !48 pC/N and 38.9% at the composition Na_(0.5)NbO_3.