Electric field influence on elasticity of crystals

Abstract

This paper presents the results of an experimental study of how an electric field affects the position of the plane of polarization of a transverse elastic wave and the acoustooptical interaction in the LiTaO3 crystal. It is established that an electric field of ±1×106 V/m rotates the plane of polarization of a sound wave with frequency 580 MHz passing through 1 cm of a crystal by 2.5 degree. The variation of the resonance frequency of piezoelectric cavities subjected to a constant electric field is also demonstrated with longitudinal vibrations in La3Ga5SiO14 crystal rods at temperatures between –60 and 80°C. For a field of ±1,5×10 6 V/m and α = 15°, the relative change of the frequency is ±120×10 –6. It is shown that La3Ga5SiO14 crystals offer a set of physical parameters that makes them promising for electrically controlled and nonlinear acoustoelectronic devices.