Phase Formation and Phase Transitions in Nonstoichiometric Sodium Bismuth Titanate Ceramics


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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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