Electromechanical coupling of surface acoustic waves in the vicinity of the phase transition in triglycine sulfate

Abstract

The temperature dependences of an effective piezoelectric constant have been determined in the vicinity of the Curie temperature in the presence of externally applied electric fields from simultaneous measurements of the temperature variations of the electromechanical coupling constant of surface acoustic waves and of the dielectric constant. It is shown that the experimental results can be explained on the assumption that piezoelectricity in triglycine sulfate is of an ’’induced’’ and not an ’’intrinsic’’ nature.