E-field-induced polarization rotation in Pb(Mg1/2Nb2/3)1-xTixO3 crystal
Tu, C. -S.
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A sequence of field-induced phase transformations was observed by means of a polarizing microscope on a (111)-cut single crystal Pb(Mg1/3Nb2/3)0.67Ti0.33O3 at room temperature with an electric field applied along the  direction. As electric field increases, polarizations of the rhombohedral R domains whose polar directions are not along  rotate first toward a tetragonal T phase associated with 90° domain walls. Then the crystal gradually reaches total optical extinction for all polarizer angles at 12 kV/cm, indicating a single  rhombohedral R111 domain with polarization aligned with the electric field. These field-induced phase transformations are irreversible and proceed most likely through MA -type monoclinic distortions, i.e., R→MA→T→MA→R111.
C.-S. Tu, I.-C. Shih, V.H. Schmidt, and R. Chien, “E-field-induced polarization rotation in Pb(Mg1/2Nb2/3)1-xTixO3 crystal,” Appl. Phys. Lett. 83, 1833-1835 (2003).