Relationship between local structure and relaxor behavior in perovskite oxides

Ilya Grinberg, Pavol Juhás, Peter K. Davies, Andrew M. Rappe

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

Despite intensive investigations over the past five decades, the microscopic origins of the fascinating dielectric properties of ABO3 relaxor ferroelectrics are currently poorly understood. Here, we show that the frequency dispersion that is the hallmark of relaxor behavior is quantitatively related to the crystal chemical characteristics of the solid solution. Density functional theory is used in conjunction with experimental determination of cation arrangement to identify the 0 K structural motifs. These are then used to parametrize a simple phenomenological Landau theory that predicts the universal dependence of frequency dispersion on the solid solution cation arrangement and off-center cation displacements.

Original languageEnglish
Article number267603
JournalPhysical Review Letters
Volume99
Issue number26
DOIs
StatePublished - 31 Dec 2007
Externally publishedYes

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