Microstructure, Ferroelectric and Piezoelectric Properties of PZT-PMnSbN Ceramics

摘要

In this paper, in order to achieve a type of material with mixing “soft” and “hard” properties for piezoelectric transformer applications, polycrystalline ceramics of PbZrO₃ – PbTiO₃ – Pb[(Mn_1/3Nb_2/3)_x(Sb_1/2Nb_1/2)_1-x]O₃ (PZT-PMnSbN), x = 0.4; 0.5; 0.6; 0.7; 0.8; 0.9; 1.0, having a rhombohedral perovskite structure have been synthesized by the Columbite precursor method. Scanning electron micrograph (SEM) shows the compactness of the sample and the average grain size was found about ~ 1.89 μm. The electromechanical coupling factor (k_p), piezoelectric constant (d₃₁), mechanical quality factor (Q_m) of PZT-PMnSbN composition ceramics with x = 0.7 showed the optimal value of 0.6, 180 pC/N, and 1895, respectively, and spontaneous polarization P_r ≈ 49.2μC/cm² were observed at room temperature. These values indicated that the newly developed composition may be suitable for piezoelectric transformer applications.