Piezoelectric gap waves between a piezoceramic half-space and a piezoceramic plate

The propagation of piezoelectric gap waves between a piezoceramic half-space and a piezoceramic plate is investigated in the framework of the theory of linear piezoelectricity. Anti-plane shear electroacoustic waves are emphasized. Secular equation for describing dispersion relation is given. The present solutions reduce to the existing results such as the well-known Bleustein–Gulyaev waves for a piezoceramic half-space with an unelectroded surface or electroded surface, the waves propagating in a piezoceramic plate, and the gap waves between two piezoceramic half-spaces. Numerical results are carried out for BaTiO3, PZT-4, and PZT-5H piezoelectric ceramics.