High-power piezoelectric properties of (Na,K)NbO₃–based ceramics

Abstract

(Na,K)NbO₃ (NKN)-based material is one of the candidates for replacing (Pb,Zr)TiO₃ (PZT). In this paper, we report the effect of dopants on the high-power piezoelectric characteristics of NKN?based ceramics. CuO-doped NKN (NKN-Cu) exhibited the highest Q_m even under high-power. The measurable vibration velocity of NKN-Cu reached more than 0.5 m/sec with the heat generation of less than 15 ^oC. Although the heat generation was accelerated with the increase of vibration velocity, the decrease of Q_m was relatively small under larger vibration amplitude. Moreover, NKN-Cu showed similar Q_m values in both resonance and anti-resonance modes.