Monte Carlo simulation on dielectric relaxation and dipole cluster state in relaxor ferroelectrics

doi:10.1088/1674-1056/19/9/097702

中国物理B ›› 2010, Vol. 19 ›› Issue (9): 97702-097702.doi: 10.1088/1674-1056/19/9/097702

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Monte Carlo simulation on dielectric relaxation and dipole cluster state in relaxor ferroelectrics

朱琛, 刘俊明

Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China

收稿日期:2010-04-15 修回日期:2010-04-20 出版日期:2010-09-15 发布日期:2010-09-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 50832002 and 10874035), and the National Basic Research Program of China (Grant No. 2009CB623303).

Monte Carlo simulation on dielectric relaxation and dipole cluster state in relaxor ferroelectrics

Zhu Chen(朱琛) and Liu Jun-Ming(刘俊明)^†

Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China

Received:2010-04-15 Revised:2010-04-20 Online:2010-09-15 Published:2010-09-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 50832002 and 10874035), and the National Basic Research Program of China (Grant No. 2009CB623303).

摘要/Abstract

摘要： The Ginzburg--Landau theory on ferroelectrics with random field induced by dipole defects is studied by using Monte Carlo simulation, in order to investigate the dipole configuration and the dielectric relaxation of relaxor ferroelectrics. With the increase of random field, the dipole configuration evolves from the long-range ferroelectric order into the coexistence of short-range dipole-clusters and less polarized matrix. The dipole-cluster phase above the transition temperature and superparaelectric fluctuations far below this temperature are identified for the relaxor ferroelectrics. We investigate the frequency dispersion and the time-domain spectrum of the dielectric relaxation, demonstrating the Vogel--Fulcher relationship and the multi-peaked time-domain distribution of the dielectric relaxation.

Abstract: The Ginzburg–Landau theory on ferroelectrics with random field induced by dipole defects is studied by using Monte Carlo simulation, in order to investigate the dipole configuration and the dielectric relaxation of relaxor ferroelectrics. With the increase of random field, the dipole configuration evolves from the long-range ferroelectric order into the coexistence of short-range dipole-clusters and less polarized matrix. The dipole-cluster phase above the transition temperature and superparaelectric fluctuations far below this temperature are identified for the relaxor ferroelectrics. We investigate the frequency dispersion and the time-domain spectrum of the dielectric relaxation, demonstrating the Vogel–Fulcher relationship and the multi-peaked time-domain distribution of the dielectric relaxation.

Key words: relaxor ferroelectrics, domain structure, relaxation spectrum, Ginzburg–Landau theory

中图分类号:

7780

朱琛, 刘俊明. Monte Carlo simulation on dielectric relaxation and dipole cluster state in relaxor ferroelectrics[J]. 中国物理B, 2010, 19(9): 97702-097702.

Zhu Chen(朱琛) and Liu Jun-Ming(刘俊明). Monte Carlo simulation on dielectric relaxation and dipole cluster state in relaxor ferroelectrics[J]. Chin. Phys. B, 2010, 19(9): 97702-097702.

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Monte Carlo simulation on dielectric relaxation and dipole cluster state in relaxor ferroelectrics

Monte Carlo simulation on dielectric relaxation and dipole cluster state in relaxor ferroelectrics

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