Piezoelectric and ferroelectric properties of CN-doped K_(0.5)Na_(0.5)NbO_3 lead-free ceramics

摘要

In this paper, lead-free (Na_(0.5)K_(0.5))NbO_3 ceramics doped with 1 mol % CuNB_2O_6 ceramics have 021been prepared by the conventional mixed oxide method with sintering temperature at 1075 ℃. Microstructural analyses of NKN-xCN ceramics have been carried out and compared using x-ray diffraction and scanning electron microscope. The dependence of doping amount of the CN-doped NKN ceramics on the piezoelectric and ferroelectric properties has been investigated. The results show that the CN-doped NKN specimens sintered at 1075 ℃ present excellent "hard" piezoelectric properties of k_p=40%, k_t=45%, K_33=57%, and ferroelectric properties E_c=25.5 kV/cm and P_r = 22.63 μc/cm~2. The mechanical quality factor (Q_m) of NKN ceramics with CN additive is extraordinarily high (1933).