The Piezoelectric Properties of (Na_0.5K_0.5)NbO₃-K_5.4Cu_1.3Ta₁₀O₂₉ Ceramics with Various K_5.4Cu_1.3Ta₁₀O₂₉ Doping and Sintering Temperatu

摘要

(1-X) (NKN-KCT) lead-free piezoelectric ceramics have been synthesized by the conventional solid state sintering method, and their sinterability and piezoelectric properties were investigated. Typically, this material is sintered between 1,025 and for 2 hours to achieve the required densification. Crystalline structures and Microstructures were analyzed by X-ray diffraction and scanning electron microscope. The density, dielectric constant ( ), piezoelectric constant , electromechanical coupling factor and mechanical quality factor value of the NKN ceramics depended upon the KCT content and the sintering temperature. In particular, the KCT addition to NKN greatly improved the mechanical quality factor value. The ceramic with X = 1.0 mol% sintered at exhibited optimum properties ( =246, =95, =0.38 and =1,826). These results indicate that the ceramic is a promising candidate material for applications in lead free piezoelectric transformer and filter materials.