Dielectric response of ferroelectric relaxors

    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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