Channeled acoustic waves - Elastic waves of a new type of polydomain ferroelectrics

In an effort to detect channeled acoustic waves in ferroelectrics, experiments were conducted with samples of a piezoelectric ceramic polarized along the thickness by a static electric field of 5 x 10 to the -6th V/m at 300 K for 10 min. A PbSnTe film with a thickness of (3-4) x 10 to the -6th m was deposited on one of the surfaces perpendicular to the polarization direction for each sample. Paths were plotted along which channeled acoustic waves propagated for various excitation points. Analysis of the measured temporal characteristics of these paths shows that the propagation velocity of these waves is 20,000-30,000 m/s for this material. It is concluded that, because of the threshold involved in the excitation of the channeled acoustic waves, these waves can be utilized to develop a variety of structures for digital signal processing.