Published online by Cambridge University Press: 01 February 2011
Lithium sodium potassium niobate (Li, Na, K)NbO3 (LNKN) piezoelectric ceramics were prepared by using conventional solid state process. The phase structures of LNKN ceramics were characterized by x-ray diffraction (XRD). The dielectric properties of LNKN ceramics have been also studied at different temperature and frequency. It was found that LNKN ceramics have high Curie temperature T c(about 460°C), and relatively high piezoelectric constant d 33 (∼200pC/N) and high electromechanical coupling coefficient k p(∼0.40). Both of the piezoelectric constant d 33 and electromechanical coupling coefficient k p of LNKN ceramics decreased with the increasing of sintering temperature. The piezoelectric property dependence of composition of LNKN ceramics has also been studied.