Elastic, piezoelectric, and dielectric properties of multidomain 0.67Pb(Mg1/3Nb2/3)O-3-0.33PbTiO(3) single crystals

The elastic, piezoelectric, and dielectric constants of 0.67Pb(Mg1/3Nb2/3)O -3-0.33PbTiO(3) domain engineered single crystal were determined experiment ally by using ultrasonic and resonance methods. It was confirmed that the s ingle crystal system has large electromechanical coupling coefficient k(33) (similar to 94%) and piezoelectric constant d(33) (similar to 2800 pC/N) i f the poling is done along the [001] of pseudocubic directions. A soft shea r mode with a velocity of 880 m/s was observed in the [110] direction with displacement in [(1) over bar 10]. 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. (C) 2001 American Institute of Physics.