High Qm Lead Free Sodium Potassium Niobate Piezoelectric Ceramics and Middle Frequency Resonator

Abstract

Density K₄CuNb₈O₂₃ modified (Na_0.5K_0.5)NbO₃ (NKN:KCN) ceramics with high mechanical quality factor Q_m were synthesized by using conventional mixing oxide process. The maximum value of Q_m of NKN:KCN ceramics reaches up to 1150, the planar electromechanical coefficient k_p of NKN:KCN ceramics maintains a relative high level, which is about 40%. Moreover, the Curie temperature of NKN:KCN ceramics is above 380 . Based upon this kind of lead-free piezoelectric ceramics, a new type of lead-free middle frequency (455 kHz) ceramic resonators were designed and produced. This kind of lead-free ceramic resonator can be used in the remote controller.