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

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

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.

Keywords: relaxor ferroelectrics domain structure relaxation spectrum Ginzburg–Landau theory

Received: 15 April 2010
Revised: 20 April 2010
Accepted manuscript online:

PACS:	7780
	7780D
	7740
	7780B

Fund: 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).

Cite this article:

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

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

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