Relaxor behavior and morphotropic phase boundary in a simple model

Yusuke Tomita, Takeo Kato

研究成果: Article

5 引用 (Scopus)

抄録

A simple model to reproduce the strong enhancement of the dielectric response near the morphotropic phase boundary (MPB) is proposed. This model consists of a long-range dipole-dipole interaction and compositional chemical disorder incorporated by the variation in lengths of dipole moments. By applying a Monte Carlo simulation, we show that a ferroelectric boundary phase appears between an antiferroelectric phase and a relaxor ferroelectric phase at an optimal strength of randomness. In the boundary phase, the ferroelectric domain becomes extremely large and flexible to external electric fields, leading to a huge dielectric response. This observation indicates that the huge dielectric response near the MPB originates from local polarization rotation under the suppression of anisotropy by phase competition.

元の言語English
記事番号063002
ジャーナルJournal of the Physical Society of Japan
82
発行部数6
DOI
出版物ステータスPublished - 2013 6

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dipoles
dipole moments
retarding
disorders
anisotropy
electric fields
augmentation
polarization
simulation
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

これを引用

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AU - Kato, Takeo

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AB - A simple model to reproduce the strong enhancement of the dielectric response near the morphotropic phase boundary (MPB) is proposed. This model consists of a long-range dipole-dipole interaction and compositional chemical disorder incorporated by the variation in lengths of dipole moments. By applying a Monte Carlo simulation, we show that a ferroelectric boundary phase appears between an antiferroelectric phase and a relaxor ferroelectric phase at an optimal strength of randomness. In the boundary phase, the ferroelectric domain becomes extremely large and flexible to external electric fields, leading to a huge dielectric response. This observation indicates that the huge dielectric response near the MPB originates from local polarization rotation under the suppression of anisotropy by phase competition.

KW - Dielectric response

KW - Domain structure

KW - Monte carlo simulation

KW - Morphotropic phase boundary

KW - Relaxors

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