Abstract
The dielectric dispersion of Cd2Nb2O7 pyrochlore in a weak electric field was studied in a broad frequency range (100 Hz to 13 MHz) using the crystal samples slowly cooled (0.5 K/min) in the temperature interval from 300 to 80 K. As the temperature decreased down to T c=196 K and T max∼190 K, the dielectric permittivity exhibited deviation from the Curie-Weiss law. It is suggested that this behavior is related to the development of a short-range correlation between microscopic polar regions formed at T→T +max . The local order parameter q(T) ∼ 〈P i P j 〉1/2 was calculated using the permittivity ε′(T) measured at various frequencies. The variation of this parameter is compared to that of the spontaneous polarization P s (T) determined from the measurements of a pyroelectric current in the external electric field E dc =0.95 kV/cm. In the frequency range from 100 Hz to 13 MHz, the dispersion of the dielectric response in the temperature region of 180–192 K is characteristic of a relaxator ferroelectric featuring a glasslike behavior. The parameters of this state were determined, including the activation energy of the polarization fluctuations (E a ≈0.01 eV), the relaxation rate at T → ∞ (f 0=1.9×1012 Hz), and the polarization fluctuation freezing temperature (T f =183 K). In Cd2Nb2O7 pyrochlore, in contrast to the known relaxator ferroelectrics of the PMN type studied previously, this state coexists with the normal ferroelectric state appearing at T c.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 121, No. 2, 2002, pp. 462–470.
Original Russian Text Copyright © 2002 by Kolpakova, Charnetzki, Nawrochik, Syrnikov, Lebedev.
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Kolpakova, N.N., Charnetzki, P., Nawrochik, W. et al. Dielectric relaxation and ferroelectricity in Cd2Nb2O7 pyrochlore. J. Exp. Theor. Phys. 94, 395–402 (2002). https://doi.org/10.1134/1.1458490
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DOI: https://doi.org/10.1134/1.1458490