Elastic, piezoelectric, and dielectric properties of multidomain 0.67Pb„Mg1Õ3Nb2Õ3...O3 – 0.33PbTiO3 single crystals

The elastic, piezoelectric, and dielectric constants of 0.67Pb~Mg1/3Nb2/3!O3–0.33PbTiO3 domain engineered single crystal were determined experimentally by using ultrasonic and resonance methods. It was confirmed that the single crystal system has large electromechanical coupling coefficient k33 ~;94%! and piezoelectric constant d33 ~;2800 pC/N! if the poling is done along the @001# of pseudocubic directions. A soft shear mode with a velocity of 880 m/s was observed in the @110# direction with displacement in @ 1̄10# . Using the measured data, the orientation dependence of phase velocities and electromechanical coupling coefficients were calculated. The origin of experimental errors and their influence on measured results are also examined. © 2001 American Institute of Physics. @DOI: 10.1063/1.1390494#