ON THE EXISTENCE PROBLEM FOR LOCALIZED ACOUSTIC-WAVES ON THE INTERFACE BETWEEN 2 PIEZOCRYSTALS

The investigation of the existence problem for inhomogeneous acoustic waves on the interface between two piezocrystals of arbitrary anisotro py is performed on the basis of the surface impedance method. It is sh own that not more than two localized waves may exist if two piezoelect ric half-infinite spaces are in welded contact and the electrical boun dary conditions require the electrical potential to vanish on the inte rface. However, if the normal projection of electrical induction is as sumed to be zero on the interface, then at most one interfacial wave c omes into existence. For two piezoelectric crystals in sliding contact at most three or at most two ''slip'' intrinsic waves may appear depe nding on the electrical boundary conditions. But if two piezocrystals are separated by an air gap, then not more than four inhomogeneous ''g ap'' waves propagate along the gap. The existence problem for localize d acoustic waves on the interface between two piezomagnetic crystals i s also discussed.