Electric-field-induced strain behavior of differently oriented and componential (1-x)Pb(Mg1/3Nb2/3)O(3)xPbTiO(3) (PMNT) crystals was investigated. An optimum composition range (29 <= x <= 31%) of < 001 >-oriented PMNT crystals was ascertained for multilayer actuator applications, which exhibited high-strain and low-hysteresis behavior. The rhombohedral (monoclinic)-tetragonal phase-transition behavior in PMNT single crystals is dependent on their thermal and electric history, which markedly impacts on the strain performance of the crystals. In contrast to PZT-SF (doped PZT ceramics) multilayer actuators, the strain values for 20-layer PMNT actuators with individual element sizes of 6x6x0.3 mm(3) are larger by more than five times at 20 kV/cm (0.373% compared to 0.072%), and 23-mu m displacements can been achieved. Against 40-N load, the displacements are decreased to 20.2 mu m.
1.Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 201800, Peoples R China 2.Chinese Acad Sci, Inst Opt & Elect, Chengdu 610209, Peoples R China
Feng, Z,Luo, H,Yin, Z,et al. High electric-field-induced strain of Pb(Mg1//3Nb2/3)O-3-PbTiO3 crystals and their application in multilayer actuators[J]. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING,2005,81(6):1245-1248.