Title

Dielectric response of ferroelectric relaxors

Authors

Authors

X. Duan; W. Luo; W. Wu;J. S. Yuan

Comments

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Abbreviated Journal Title

Solid State Commun.

Keywords

disordered systems; ferroelectrics; dielectric response; phase; transitions; ISING SPIN-GLASSES; MAGNESIUM NIOBATE RELAXORS; RELAXATION; DYNAMICS; BEHAVIOR; Physics, Condensed Matter

Abstract

The real and imaginary parts of dielectric permittivities of a ferroelectric relaxer are studied by the Monte Carlo (MC) simulation as a function of frequency and temperature. The simulation results are analyzed by the fluctuation-dissipation theory (FDT). In contrast to the previous results (Appl. Phys. Lett, 69 (1996) 2353), the imaginary part of permittivity qualitatively agrees with the experimental results very well. The measuring frequency and T-pi, the temperature at which the imaginary part of dielectric permittivity reaches its maximum, follow the Vogel-Fulcher relationship. The l/f type of noise is also found, which implies a glassy phase at low temperature. We suggest that the dipolar glass model can explain the observed non-Debye relaxation and non-Arrhenius temperature dependence of the relaxation time. The conduction loss assumption is not necessary for explaining the imaginary part of dielectric permittivity behaviors. (C) 2000 Elsevier Science Ltd. All rights reserved.

Journal Title

Solid State Communications

Volume

114

Issue/Number

11

Publication Date

1-1-2000

Document Type

Article

Language

English

First Page

597

Last Page

600

WOS Identifier

WOS:000087012300008

ISSN

0038-1098

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