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It is demonstrated that for classical perovskites such as BaTiO3, SrTiO3 andPbTiO3 electrostrictive strain induced by an electric field may not obeytraditionally considered "extension along the field, contraction perpendicularto it" behavior if a sample is cut obliquely to the cubic crystallographicdirections.

Positive effective Q12 electrostrictive coefficient in perovskites