WAVE-PROPAGATION IN A PIEZOELECTRIC LAYER

The dispersion relations of oscillation modes in a piezoelectric slab with hexagonal symmetry are given, considering the slab infinite with respect to the axes x(1) and x(2) with the six-order symmetry axis per pendicular to the x(1)-x(2) plane. Four types of modes are identified: two of them are transversal horizontal and the other two are associat ed to electrostatic potential waves which determine the longitudinal a nd flexural modes. The secular equations for these modes are given and numerical results for the piezoelectric transducer ceramic slab are o btained and compared to experimental results with a very good agreemen t. (C) 1997 American Institute of Physics.