Face shear piezoelectric properties of relaxor-PbTiO_3 single crystals

摘要

Poling relaxor-PbTiO_3 single crystals along pseudocubic [Oil] results in a macroscopic symmetry of mm2, enabling a large face shear d_(36) in Zt± 45° cut crystals. In order to allow the determination of electrical properties by the resonance method, square samples are required. Using Pb(In_(0.5)Nb_(0.5))O_3-Pb(Mg_(l/3)Nb_(2/3))O_3-PbTiO_3 crystals, piezoelectric d_(36) coefficients were determined to be in the range of 2000-2500 pC/N, with electromechanical coupling factor k_(36) ~0.80-0.83. Mechanical quality factor Q~ 180 and ultralow frequency constant of ~500 Hz m were obtained. Together with the wide temperature usage range (up to ~110 ℃) and high ac driving field stability (~5 kV/cm), such face shear crystals have a promising potential for ultralow-frequency-transducer applications.