Abstract: In this paper, the Pb(Mg1/3Nb2/3 )O3-Pb(Zr,Ti)O3 (PMN-PZT) piezoelectric ceramics were prepared by one-step synthesis method. The effect of Sm-doping on the structure and electrical properties of PMN-PZT ceramics were investigated. High piezoelectric performances are achieved in 2. 0% ( mole fraction) Sm-PMN-PZT ceramics, which are piezoelectric constant d33 = 611 pC/ N, electromechanical coupling coefficient kp = 0. 68, dielectric loss tan δ = 1. 65% , relative dielectric constant εr = 2 650, along with a high Curie temperature TC = 283 ℃ . Furthermore, a large unipolar strain of 2. 0% Sm-PMN-PZT ceramics is attained to be 0. 20% at the electric field of 3 kV/ mm, which shows the characteristic of large strain material. These results suggest that the Sm-doped PMN-PZT ceramics with outstanding comprehensive properties are promising in the field of transducers, sensors, actuators, etc.
Key words: PMN-PZT piezoelectric ceramics; rare-earth element doping; piezoelectricity; electromechanical coupling coefficient; Curie temperature; large strain
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