PHYSICAL PROPERTIES OF PZT-PZN-PMnN CERAMICS WERE FABRICATED BY B-SITE OXIDE MIXING TECHNIQUE

Abstract

The 0.65Pb(Zr_0.47Ti_0.53)]O₃ - 0.275Pb(Zn_1/3Nb_2/3)O₃ - 0.075Pb(Mn_1/3Nb_2/3)O₃ (PZT-PZN-PMnN) ceramics were synthesized by conventional solid-state reaction method (MO) and the B-site oxide mixing technique (BO). Experimental results showed that the B-site oxide mixing technique exhibits superior behavior compared with MO method in suppressing pyrochlore phases, stabilizing perovskite structure, and improving the physical properties of PZT-PZN-PMnN ceramics. The BO ceramic samples have the optimal electromechanical properties: the electromechanical coupling factor (k_p) of 0.51, (k_t) of 0.38, the dielectric constant (ε) of 1100, the dielectric loss (tand) of 0.005, the maximum dielectric constant (e_max) of 7614, the mechanical quality factor (Q_m) of 1111 and the remanent polarization (P_r) of 20.5 mC/cm², which makes it as a promising material for high power piezoelectric devices.