Effect of PbZrO₃ on the phase structure and electrical properties of 0.1BiYbO₃-0.9PbTiO₃ piezoelectric ceramics

(1-x)(0.1BiYbO₃-0.9PbTiO₃) -xPbZrO₃(BYPT-PZ) piezoelectric ceramics were prepared by the conventional solid state reaction. The effects of the content of PbZrO₃ on the phase structure and electrical properties were investigated. The result revealed that the addition of PbZrO₃ can suppress the generation of the pyrochlore phase effectively. There were two phases coexisting in the BYPT-PZ ceramics, one is the perovskite phase, the other is ZrO₂ phase. With the increasing of PbZrO₃, the dielectric constant of ε_r, the piezoelectric constant of d₃₃ and the electric mechanism of k_p increased, while the curie temperature of T_c, the mechanical quality factor of Q_m and the dielectric loss of tanδ decreased. When the content of PbZrO₃ was 0.45 mol, the performances of the material were optimum. The piezoelectric costant (d₃₃), Curie temperature (T_C), dielelctric constant (ε_r), electric mechanism (k_p), the remnant polarization (P_r) and the coercive field (E_c) could be 223 pC/N, 390°C, 1265, 0.42, 20 μC/cm² and 2.4 kV/mm respectively.