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

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.


Published in:
Physical Review B, 57, 1, 18-21
Year:
1998
ISSN:
0163-1829
Keywords:
Note:
Tagantsev, AK Ecole Polytech Fed Lausanne, Lab Ceram, CH-1015 Lausanne, Switzerland Ecole Polytech Fed Lausanne, Lab Ceram, CH-1015 Lausanne, Switzerland
Yp839
Times Cited:64
Cited References Count:20
Laboratories:




 Record created 2006-08-21, last modified 2018-03-17


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