The electric-field induced polarization (P–E) and strain (ε–E) characteristics of 〈110〉c-oriented 0.7Pb(Mg1/3Nb2/3)O3–0.3PbTiO3 crystals have been investigated, under both unipolar and bipolar drive. A field-induced transformation was observed below saturation. Under unipolar drive, the P–E and ε–E loops were anhysteretic even at the transformation point, demonstrating complete reversibility between ferroelectric rhombohedral and orthorhombic phases. The results show that “polarization rotation” can occur between 〈111〉c and 〈110〉c, where the polarization is confined to the (100)c in a monoclinic Mb type symmetry.
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Viehland et al. (2002) studied this question.
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