SH Waves in (1 -x)Pb(Mg1/3Nb2/3)O3- xPbTiO3 Piezoelectric Layered Structures Loaded with Viscous Liquid

The velocity dispersion and attenuation of shear horizontal (SH) waves in a layered piezoelectric structure loaded with viscous liquid is studied, where the (1 - x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 [PMN-xPT] single crystal is chosen as the piezoelectric layer. The PMN-xPT is being polarized along [011]c and [001]c so that the macroscopic symmetries are mm 2 and 4 mm, respectively. For the nonconductive liquid, the electrically open and shorted conditions at the interface between the liquid and the piezoelectric layer are considered. The phase velocity equations are derived analytically. The effects of the electrically boundary condition, the viscous coefficient and mass density of liquid as well as the thickness of the PMN-xPT layer on the phase velocity and attenuation are graphically illustrated. The results show that the phase velocity for the [011]c polarized PMN-0.29PT is much smaller than that for the [001]c polarized PMN-0.33PT, and the effects of viscous coefficient and piezoelectric layer thickness on the phase velocity for the [011]c case are stronger than that for the [001]c case. In addition, the electrical boundary conditions have an obvious influence on the propagation behaviors. These results can be useful for the designs and applications of acoustic wave devices and liquid biosensors.