Correlations between nanoscale chemical and polar order in relaxor ferroelectrics and the lengthscale for polar nanoregions

被引：138

作者：

Burton, BP ^{[1
]}

Cockayne, E

Waghmare, UV

机构：

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

[2] JNCASR, J Nehru Theoret Sci Unit, Bangalore 560064, Karnataka, India

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.72.064113

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Molecular-dynamics simulations of a first-principles Hamiltonian for the model relaxor ferroelectric Pb(Sc1/2Nb1/2)O-3 were used to determine the nature of correlations between chemical and polar short-range order. Relative to chemically disordered regions (CDRs), chemically ordered regions (CORs) exhibit enhanced polarization, and polarization fluctuations at all temperatures. Magnitudes of pairwise cluster-cluster polarization correlations follow the trend COR-COR, COR-CDR, CDR-CDR correlations. This result implies that the characteristic lengthscale for polar nanoregions is the same as for chemical short-range order.

引用

页数：5

共 29 条

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