Electrostriction

Electrostriction describes the deformation of a dielectric medium in response to an applied electric field. In the usual definition of the term refers only to the electrostriction of the proportion of the effect, in which the deformation is independent of the direction of the applied field and is proportional to the square of the field. This distinguishes the electrostriction of the inverse piezoelectric effect, which describes the linear response of the deformation of the ball.

Electrostriction is described by the electrostrictive coefficient. One distinguishes between electrostrictive distortion coefficients which describe the response of the distortion to the electric field,

And electrostrictive voltage coefficients that describe the reaction of the mechanical stress on the electric field:

First order effects are described by the piezoelectric coefficients.

However, the concept of electrostriction in the literature is often used unclean. In the general formulation electrostriction refers to any interaction between the deformation of a dielectric medium and an adjacent field. In this use, the electrostriction then includes the inverse piezoelectric effect in which a change in volume is induced by an applied voltage.

Through electrostriction noise could occur when highly variable electric fields at a dielectric ( eg in a capacitor ) are caused - much like it (eg in coil cores ) can come in varying magnetic fields to sounds by magnetostriction in ferromagnetic materials.