Elastic, dielectric, and piezoelectric characterization of 0.70Pb(Mg_(1/3)Nb_(2/3))O_3-0.30PbTiO_3 single crystals

摘要

In this letter, we present our investigation of elastic, piezoelectric, and dielectric performances in 0.70Pb(Mg_(1/3)Nb_(2/3))O_3-0.30PbTiO_3 (0.70PMN-0.30PT) single crystals using a resonance technique. The complete set of constants was determined for this [001]-poled domain-engineered system by the effective tetragonal 4-mm symmetry. The electromechanical coupling coefficient k_(33), k_(31), k_(31<110>), k_t and k_(15) are 92 percent, 89.5 percent, 76 percent, 62 percent, and 55 percent, respectively. The 0.70PMN-0.30PT crystal, which is slightly away from the morphotropic phase boundary (MPB), has remarkable and stable piezoelectric properties and becomes one of the premier considering materials for present applications in making high-sensitivity medical ultrasonic transducers and large displacement actuators.