Positive effective Q12 electrostrictive coefficient in perovskites

TL;DR

This paper shows that in classical perovskites like BaTiO3, SrTiO3, and PbTiO3, the electrostrictive strain behavior can deviate from traditional expectations when samples are cut obliquely, revealing a positive Q12 coefficient.

Contribution

It reveals that electrostrictive strain in perovskites can exhibit positive Q12 coefficients under certain cut orientations, challenging traditional assumptions.

Findings

Electrostrictive strain may not follow traditional behavior in obliquely cut samples.

Positive Q12 electrostrictive coefficient observed in classical perovskites.

Sample orientation significantly affects electrostrictive response.

Abstract

It is demonstrated that for classical perovskites such as BaTiO3, SrTiO3 and PbTiO3 electrostrictive strain induced by an electric field may not obey traditionally considered "extension along the field, contraction perpendicular to it" behavior if a sample is cut obliquely to the cubic crystallographic directions.