Electric-field-induced orthorhombic to rhombohedral phase transition in [111]_c-oriented 0.92Pb(Zn_(1/3)Nb_(2/3))O_3-0.08PbTiO_3

摘要

Strain-field measurements and in situ polarized light microscopy have been used to evidence a hysteretic, irreversible electric-field-induced transition to a quasimonodomain rhombohedral phase in [111]_c-oriented, pseudo-orthorhombic PZN-8PT [0.92Pb(Zn_(1/3)Nb_(2/3))O_3-0.08PbTiO_3]. This first-order transition most likely occurs following the simplest path O-M_B-R, i.e., via polarization rotation in the (10-l)_c plane. The measured strain-field loops are compared to those for rhombohedral, [111]_c-oriented PMN-28PT [0.72Pb(Mg_(1/3)Nb_(2/3))O_3-0.28PbTiO_3] and PMN -33PT [0.67Pb(Mg_(1/3)Nb_(2/3))O_3-0.33PbTiO_3] where no electric-field-induced transition is possible.