PIEZOELECTRIC PROPERTIES OF BIDOMAIN LINBO3 CRYSTALS

Our studies of piezoelectric properties of bidomain (''head-to-head'') Z-cut plates of LiNbO3 formed by diffusion treatment show that the sp ectrum of excited vibrations differs from that of monodomain crystals. We found that the length- and width-longitudinal vibrations are suppr essed and bending vibrations appear to be maximal for an inverted laye r thickness equal to one-half of the sample thickness. The amplitude o f the fundamental frequency and its overtones for the thickness vibrat ions depend on the thickness of the inverted layer. A model explaining these properties is proposed. (C) 1995 American Institute of Physics.