Piezoelectric Properties of 2.0%Sm-0.25Pb(Mg1/3Nb2/3)O3-0.75Pb(Zr1-xTix)O3 Ceramics Prepared by One-step Method
WANG Yuequn1, XIANG Guanglei1,*, GAO Liang1, WANG Yiping2
1 Hangzhou Applied Acoustics Research Institute, Hangzhou 310023, China 2 State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China
Abstract: Niobium magnesium-lead zirconate titanate (Pb(Mg1/3Nb2/3)O3-Pb(Zr, Ti)O3, PMN-PZT) ceramics are usually prepared by a two-step synthesis method where the MgNb2O6 precursor needs to be synthesized firstly. In industrial production, the two-step synthesis method has relatively low production efficiency and high cost and affects the consistency of product performance. In this work, 2.0mol%Sm-0.25Pb-(Mg1/3Nb2/3)O3-0.75Pb(Zr1-xTix)O3 (Sm-PMN-PZT) piezoelectric ceramics with high density and high piezoelectric properties were prepared by a one-step synthesis method with high efficiency and low cost. In the range of x=0.52—0.53, the morphotropic phase boundaries (MPBs) with the coexistence of rhombohedral (R) and tetragonal phases (T) were constructed. Introduction of Sm3+ enhances the heterogeneity of local polar structures, decreases the potential barrier required for the transition of R-T phase under external electric field (Eex), minimizes the curvature of the free energy curve and finally improves the piezoelectric properties. The ceramic at x=0.525 presents the best comprehensive electrical performance, such as piezoelectric coefficient d33=645 pC/N, the planar electromechanical coupling coefficient kp of 0.657, the relative dielectric constant εr of 3 110, the dielectric loss tanδ of 1.78%, and the ferroelectric Curie temperature TC of 242 ℃. Based on Rayleigh’s law analysis, it has been found that the ceramic at x=0.525 achieves the high piezoelectricity due to its intrinsic response of lattice contribution and reversible domain wall movement, and extrinsic piezoelectric response of irreversible domain wall movement both being enhanced.
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2023, Vol. 37 
