Local lattice dynamics and the origin of the relaxor ferroelectric behavior

被引：96

作者：

Dmowski, W. ^{[1
]}

Vakhrushev, S. B. ^{[2
]}

Jeong, I. -K. ^{[3
]}

Hehlen, M. P. ^{[4
]}

Trouw, F. ^{[4
]}

Egami, T. ^{[1
,5
,6
]}

机构：

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

[3] Pusan Natl Univ, Dept Phys, Pusan, South Korea

[4] Los Alamos Natl Lab, LANSCE, Los Alamos, NM 87545 USA

[5] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[6] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 13期

关键词：

High temperature effects - Lattice vibrations - Phonons - Polarization - Probability density function;

D O I：

10.1103/PhysRevLett.100.137602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Relaxor ferroelectricity is observed in many strongly disordered ferroelectric solids. However, the atomistic mechanism of the phenomenon, particularly at high temperatures, is not well understood. In this Letter we show the local lattice dynamics as the origin of relaxor ferroelectricity through the first use of the dynamic pair-density function determined by pulsed neutron inelastic scattering. For a prototypical relaxor ferroelectric, Pb(Mg1/3Nb2/3)O-3, we demonstrate that the dynamic local polarization sets in around the so-called Burns temperature through the interaction of off-centered Pb ions with soft phonons, and the slowing down of local polarization with decreasing temperature produces the polar nanoregions and the relaxor behavior below room temperature.

引用

页数：4

共 27 条

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