Microstructural characteristics and electrical properties of xPb(Mg_(1/3)Ta_(2/3))O_3-(0.1 -x)Pb(Mn_(1/3)Sb_(2/3))O_3-0.9Pb(Zr_(0.52)Ti_(0.48))O_3 high power piezoelectric ceramics

摘要

The quaternary piezoelectric ceramics of Pb(Mg_(1/3)Ta_(2/3))O_3-Pb(Mn_(1/3)Sb_(2/3))O_3-Pb(Zr_(0.52)Ti_(0.48))O_3 (PMgT-PMnS-PZT) were synthesized with a conventional method. The phase, microstructure, ferroelectric, dielectric and piezoelectric properties were studied in terms of PMgT content. The results indicate that all ceramics have a pure perovskite phase of tetragonal symmetry while the c/a ratio increases with PMgT content. The PMgT substitution also promotes the densification of the ceramics without significant grain growth when no more than 5 mol.%. The spontaneous polarization P_s increases consistently as revealed by the enhanced tetragonality, whereas the coercive field E_c, which is affected by the internal dipolar field, reaches a minimum at 3 mol.%. When no more than 5 mol.% PMgT is introduced, both the soft and hard properties can be improved simultaneously. However, further introduction of PMgT in place of PMnS induces a rapid decrease in Qm and increase in tan δ. The 0.05PMgT-0.05PMnS-0.9PZT ceramics have the optimal overall performance: ε_(33)~T = 683, tanδ=0.3%, d_(33) = 227 pC/N, k_p =0.55, Q_m -1830. The ceramics are promising candidates for high power resonant actuator applications.