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

Journal Article · Thu Jan 01 00:00:00 EST 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.57.18· OSTI ID:565864

Tagantsev, A K; Glazounov, A E ^[1]

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1. Laboratoire de Ceramique, EPFL, CH-1015 Lausanne (Switzerland)

It is shown that the effects of large dc bias and ac driving fields on the dielectric permittivity of single crystals of PbMg{sub 1/3}Nb{sub 2/3}O{sub 3} (PMN) relaxor 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. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 565864
• Journal Information: Physical Review, B: Condensed Matter, Vol. 57, Issue 1; Other Information: PBD: Jan 1998
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NIOBIUM OXIDES
LEAD OXIDES
MAGNESIUM OXIDES
ANISOTROPY
FERROELECTRIC MATERIALS
PERMITTIVITY
POLARIZATION