Piezoelectric properties of bidomain LiNbO3crystals

Our studies of piezoelectric properties of bidomain (‘‘head‐to‐head’’) Z‐cut plates of LiNbO3 formed by diffusion treatment show that the spectrum of excited vibrations differs from that of monodomain crystals. We found that the length‐ and width‐longitudinal vibrations are suppressed and bending vibrations appear to be maximal for an inverted layer thickness equal to one‐half of the sample thickness. The amplitude of the fundamental frequency and its overtones for the thickness vibrations depend on the thickness of the inverted layer. A model explaining these properties is proposed.Our studies of piezoelectric properties of bidomain (‘‘head‐to‐head’’) Z‐cut plates of LiNbO3 formed by diffusion treatment show that the spectrum of excited vibrations differs from that of monodomain crystals. We found that the length‐ and width‐longitudinal vibrations are suppressed and bending vibrations appear to be maximal for an inverted layer thickness equal to one‐half of the sample thickness. The amplitude of the fundamental frequency and its overtones for the thickness vibrations depend on the thickness of the inverted layer. A model explaining these properties is proposed.