Journal of Advanced Dielectrics, Volume. 13, Issue 2, 2250021(2023)

Electric field-induced phase transition from the glasslike to paraelectric phase and dielectric spectra hardening in PMN single crystal

E. Korolevaaff***... A. Molokov* and S. Vakhrushev* |Show fewer author(s)
Author Affiliations
  • Ioffe Institute, Polytekhnicheskaya 26, 194021, St.-Petersburg, Russia
  • show less

    One of the key points in the physics of the relaxors is their response to the applied DC field. Many studies of this topic were made, in particular on the influence of the field on the dielectric properties. However, practically, in all the cases, the measurements were performed at a fixed frequency and usually with the change in the temperature at the fixed field strength. In this paper, we report the evolution of the dielectric spectra at low frequencies (0.1 Hz <ω< 1 kHz) at fixed temperature 246 K on changing the DC electric field applied in (111) from 1 kV to 7 kV. Cole-Cole function was used to describe the spectra and the field dependences of the mean relaxation time τ, the oscillation strength Δ𝜀 and the width parameter α were determined. The obtained τ(E) and Δ𝜀(E) provide evidence of the field-induced transition from the nonpolar glass-like phase to the nonpolar paraelectric phase at around 1.5 kV/cm. In the paraelectric phase, very fast hardening of the spectra was observed with τ changing from 10 s to about 104s. The performed analysis demonstrated that the earlier reported positive C-V effect is completely determined by the spectra hardening, while Δ𝜀 does not show any change in the glass-like phase and monotonously decreases with a field increase in the paraelectric state. For complete understanding of the microscopic origin of the observed phenomena, a detailed study on the short-and long-range structures at the same condition is necessary.

    Tools

    Get Citation

    Copy Citation Text

    E. Koroleva, A. Molokov, S. Vakhrushev. Electric field-induced phase transition from the glasslike to paraelectric phase and dielectric spectra hardening in PMN single crystal[J]. Journal of Advanced Dielectrics, 2023, 13(2): 2250021

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Category: Research Articles

    Received: Sep. 22, 2022

    Accepted: Oct. 24, 2022

    Published Online: Jun. 16, 2023

    The Author Email: Koroleva E. (e.yu.koroleva@mail.ioffe.ru), Molokov A. (e.yu.koroleva@mail.ioffe.ru), Vakhrushev S. (e.yu.koroleva@mail.ioffe.ru)

    DOI:10.1142/S2010135X22500217

    Topics