Origin of diffuse scattering in relaxor ferroelectrics

被引：53

作者：

Ganesh, P. ^{[1
]}

Cockayne, E. ^{[2
]}

Ahart, M. ^{[1
]}

Cohen, R. E. ^{[1
]}

Burton, B. ^{[2
]}

Hemley, Russell J. ^{[1
]}

Ren, Yang ^{[3
]}

Yang, Wenge ^{[3
]}

Ye, Z. -G. ^{[4
,5
]}

机构：

[1] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

[2] NIST, Div Ceram, Mat Sci & Engn Lab, Gaithersburg, MD 20899 USA

[3] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[4] Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada

[5] Simon Fraser Univ, LABS 4D, Burnaby, BC V5A 1S6, Canada

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 14期

基金：

美国国家科学基金会;

关键词：

PEROVSKITES; BEHAVIOR; ORDER;

D O I：

10.1103/PhysRevB.81.144102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-pressure and variable temperature single-crystal synchrotron x-ray measurements combined with first principles based molecular-dynamics simulations were used to study diffuse scattering in the relaxor ferroelectric system PbSc1/2Nb1/2O3. Constant temperature experiments show a pressure-induced transition to the relaxor phase, in which butterfly- and rod-shaped diffuse scattering occurs around the {h00} and {hh0} Bragg spots. Simulations qualitatively reproduce the observed diffuse scattering features as well as their pressure-temperature behavior and show that they arise from polarization correlations between chemically ordered regions, which in previous simulations were shown to behave as polar nanoregions. Simulations also exhibit radial diffuse scattering [elongated toward and away from Q=(000)] that persists even in the paraelectric phase; consistent with previous neutron experiments on PbMg1/3Nb2/3O3.

引用

页数：7

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