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 Pis'ma v Zh. Èksper. Teoret. Fiz., 2017, Volume 105, Issue 3, Pages 175–181 (Mi jetpl5185)

CONDENSED MATTER

Study of the anisotropy of the dielectric response of Na$_{1/2}$Bi$_{1/2}$TiO$_3$ relaxor ferroelectric

V. G. Zalesskiia, A. D. Polushinaab, E. D. Obozovaa, A. V. Dmitrieva, P. P. Syrnikova, S. G. Lushnikova

a Ioffe Institute, Russian Academy of Sciences, St. Petersburg, Russia
b St. Petersburg State Electrotechnical University LETI, St. Petersburg, Russia

Abstract: The dielectric response, conductivity, and domain structure of (Na$_{1/2}$Bi$_{1/2}$)TiO$_3$ single crystals are studied in the temperature range of $290$$750 K for the [100], [110], and [111] crystallographic directions. It is shown that the region of optical isotropization is observed in polarized light in the temperature range of 570$$620$ K. In this case, the birefringence ($\Delta n$) decreases and disappears (together with the image of the domain structure) for the $[100]$ directions. The region of optical isotropization in the $[111]$ directions is characterized by the disappearance of the image of the domain structure and by the existence of individual regions with partial quenching. The domain structure in the $[110]$ directions remains distinguished against the background of a significant decrease in $\Delta n$ in the indicated temperature range. The region of isotropization is also manifested in the temperature dependence of the imaginary part of the dielectric response and is determined by the isotropic character of the conductivity in the range of $570$$620 K. The bulk conductivity has a thermally activated character with activation energies E_a=50$$60$ meV at $T<$ K and $E_a=700$$900$ meV for $T>620$ K. The low-frequency dispersion of the dielectric response is determined by the Maxwell–Wagner mechanism and is due to an increase in the ionic conductivity at temperatures above $620$ K. The anisotropy of the susceptibility holds in the entire studied ranges of frequencies ($25$ Hz–$1$ MHz) and temperatures.

 Funding Agency Grant Number Russian Science Foundation 14-12-00257

DOI: https://doi.org/10.7868/S0370274X17030092

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English version:
Journal of Experimental and Theoretical Physics Letters, 2017, 105:3, 189–194

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Revised: 16.12.2016

Citation: V. G. Zalesskii, A. D. Polushina, E. D. Obozova, A. V. Dmitriev, P. P. Syrnikov, S. G. Lushnikov, “Study of the anisotropy of the dielectric response of Na$_{1/2}$Bi$_{1/2}$TiO$_3$ relaxor ferroelectric”, Pis'ma v Zh. Èksper. Teoret. Fiz., 105:3 (2017), 175–181; JETP Letters, 105:3 (2017), 189–194

Citation in format AMSBIB
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