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Mechanism of polarization response in the ergodic phase of a relaxor ferroelectric

Authors
  • Tagantsev, A. K.
  • Glazounov, A. E.
Publication Date
Jan 01, 1998
Source
Infoscience @ EPFL
Keywords
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Unknown
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Abstract

It is shown that the effects of large de bias and ac driving fields on the dielectric permittivity of single crystals of PbMg1/3Nb2/3O3 (PMN) relaxer ferroelectric exhibit very different behavior, including anisotropy and sign of the effect, which is traced up to the high-temperature interval in the ergodic phase. The observed phenomena strongly suggest that in the ergodic phase of PMN the dielectric response to the ac field is controlled by a side-way motion of the interphase boundaries of the polar regions, rather than by the thermally activated reorientations of the local spontaneous polarization.

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