Electrostriction

Electrostriction - the effect of changing the linear dimensions of a substance when an electric field is applied to it. It is observed absolutely in all substances (in contrast to the piezoelectric effect, which exists only in crystals with a certain symmetry).

The connection between the deformation and the electric field is quadratic. The linear relationship between the deformation and the electric field is observed in piezoelectrics.

The highest values ​​of electrostriction are observed in substances that are called ferroelectric relaxors.

Formally, the electrostriction coefficient is a fourth-rank tensor ( ), depending on the mechanical stress (second rank tensor ) and polarization (first rank tensors , ).

= Q_ {ijkl} \ times P_ {k} \ times P_ {l}}

see also

• Magnetostriction