Abstract:

Pb(Sn_1/3Nb_2/3)O₃-Pb(Zn_1/3Nb_2/3)O₃-PbZrO₃-PbTiO₃ quaternary piezoelectric ceramics were prepared by conventional solid reaction sintering. The samples
were gained by changing the ratio of Zr/Ti and adding MnO₂、Sb₂O₃ and Cr in order to enhance the values of K _p and Q _m. The effect of Zr/Ti ratio on the temperature stability of the system was also studied. The results indicate that when calcination temperature is 960℃ and sintering temperature is 1240℃, the comprehensive and excellent materials can be made to fit the request of high power devices such as piezoelectric actuator and ultrasonic motor, and the main parameters are as follows: dielectric constant at room temperature ξ₃₃^T/ξ₀=1669, piezoelectric constant d₃₃=285×10^-12C/N, mechanical quality factor Q _m=2179, planar coupling coefficient K _p=54.9%, dielectric loss tanδ=0.4%.

Key words: piezoelectric ceramics, dielectric and piezoelectric properties, morphotropic phase boundary, temperature stability