The strain-stress ( k- σ) response characteristics of d001 -oriented crystals of Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 have been investigated. A stress-induced ferroelastic transformation has been observed under uniaxial stress. The k- σresponse was fitted with a Landau phenomenological model based upon a bilinear gradient coupling between ferroelastic strain and ferroelectric polarization.
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Viehland et al. (2003) studied this question.
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