Zn/Li掺杂PZT-PZN-PNN压电陶瓷的研究

The Zn/Li co-doped 0.83Pb(Zr_1/2Ti_1/2)O₃-0.11Pb(Zn_1/3Nb_2/3)O₃-0.06Pb(Ni_1/3Nb_2/3)O₃(PZT-PZN-PNN) piezoelectric ceramics were prepared by the conventional solid state method. The influences of different content of Zn/Li addition on the phase structure, the microstructure, and electrical properties were investigated. The results showed that the phase structure was shifted from the rhombohedra to tetragonal with the increase of Zn/Li content. The dielectric constant ε_r, the piezoelectric coefficient d₃₃, and the electromechanical coupling coefficient kp increased firstly and then decreased, while the dielectric loss tan δ and mechanical quality factor Q_m showed the opposite trend. The optimal piezoelectric properties with d₃₃ of 513 pC/N,k_p of 0.635, ε_r of 1 694,and tan δ of 0.023 5 were obtained when the Zn/Li content was 1wt%. The ceramics are expected to be used in the fabrication of low temperature co-fired laminated piezoelectric devices.