Guided wave propagation in 0.67Pb(Mg_(1/3)Nb_(2/3))O_3-0.33PbTiO_3 single crystal plate poled along [001]_c

摘要

Dispersion relations of Lamb waves and shear horizontal (SH) waves propagating in the [100] and [110] directions of 0.67Pb(Mg_(1/3)Nb_(2/3))O_3-0.33PbTiO_3 piezoelectric single crystal plate poled along [001]_c were calculated. Multiple crossings between symmetric and antisymmetric modes appear due to the moderate anisotropy of these crystals. As frequency increases, the velocities for SH wave modes approach 2.88 and 0.88 mm/μs, respectively, for waves propagating along [100] and [110] directions. These limiting velocities are the corresponding shear velocities of bulk crystals.