Elastic, piezoelectric, and dielectric properties of 0.58Pb(Mg1/3Nb2/3)O3-0.42PbTiO3 single crystal

The elastic, piezoelectric, and dielectric constants of 0.58Pb(Mg1/3Nb2/3)O-3-0.42PbTiO(3) (PMN-42%PT) were determined experimentally using combined resonance and ultrasonic methods. At room temperature the PMN-42%PT single crystal has tetragonal symmetry. The measured piezoelectric constant d(33) is similar to260x10(-12) C/N. The electromechanical coefficients k(15), k(31), k(33), and k(t) are 0.80, 0.39, 0.78, and 0.62, respectively. From the measured material constants the orientational dependence of phase velocities and electromechanical coupling coefficients was calculated. The results showed the tetragonal crystal exhibits isotropy in the X-Y plane and k(15), k(33), and k(t) reach their maxima in [001]. (C) 2004 American Institute of Physics.