Phase Formation and Phase Transitions in Nonstoichiometric Sodium Bismuth Titanate Ceramics
- Authors: Politova E.D.1, Mosunov A.V.1, Strebkov D.A.2, Golubko N.V.1, Kaleva G.M.1, Loginov B.A.3, Loginov A.B.2, Stefanovich S.Y.1
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Affiliations:
- Karpov Institute of Physical Chemistry (Russian State Scientific Center)
- Moscow State University
- MIET National Research University of Electronic Technology
- Issue: Vol 54, No 7 (2018)
- Pages: 744-748
- Section: Article
- URL: https://journals.rcsi.science/0020-1685/article/view/158495
- DOI: https://doi.org/10.1134/S0020168518070154
- ID: 158495
Cite item
Abstract
We have studied the phase formation, microstructure, and dielectric and ferroelectric properties of (Na0.5–xBi0.5)TiO3 and (Na0.5Bi0.5 + x)TiO3 nonstoichiometric ceramics with Na/Bi < 1 and x = 0–0.1. The grain size of the ceramics has been shown to decrease with increasing x. The temperature dependences of dielectric permittivity for the samples studied have anomalies near ~400 K and peaks at ~600 K, corresponding to ferroelectric phase transitions. The phase transitions near 400 K demonstrate relaxor behavior, indicative of the presence of polar regions in a nonpolar matrix, as supported by laser second harmonic generation measurements. In addition, the (Na0.5Bi0.5 + x)TiO3 samples with x > 0.05 have anomalies near 900 K, confirming the presence of Bi4Ti3O12 as an impurity phase, which is accompanied by an increase in the spontaneous polarization of these samples.
About the authors
E. D. Politova
Karpov Institute of Physical Chemistry (Russian State Scientific Center)
Author for correspondence.
Email: politova@cc.nifhi.ac.ru
Russian Federation, ul. Vorontsovo pole 10, Moscow, 105064
A. V. Mosunov
Karpov Institute of Physical Chemistry (Russian State Scientific Center)
Email: politova@cc.nifhi.ac.ru
Russian Federation, ul. Vorontsovo pole 10, Moscow, 105064
D. A. Strebkov
Moscow State University
Email: politova@cc.nifhi.ac.ru
Russian Federation, Moscow, 119992
N. V. Golubko
Karpov Institute of Physical Chemistry (Russian State Scientific Center)
Email: politova@cc.nifhi.ac.ru
Russian Federation, ul. Vorontsovo pole 10, Moscow, 105064
G. M. Kaleva
Karpov Institute of Physical Chemistry (Russian State Scientific Center)
Email: politova@cc.nifhi.ac.ru
Russian Federation, ul. Vorontsovo pole 10, Moscow, 105064
B. A. Loginov
MIET National Research University of Electronic Technology
Email: politova@cc.nifhi.ac.ru
Russian Federation, pl. Shokina 1, Zelenograd, Moscow, 124498
A. B. Loginov
Moscow State University
Email: politova@cc.nifhi.ac.ru
Russian Federation, Moscow, 119992
S. Yu. Stefanovich
Karpov Institute of Physical Chemistry (Russian State Scientific Center)
Email: politova@cc.nifhi.ac.ru
Russian Federation, ul. Vorontsovo pole 10, Moscow, 105064
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