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.
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Original Russian Text © E.D. Politova, A.V. Mosunov, D.A. Strebkov, N.V. Golubko, G.M. Kaleva, B.A. Loginov, A.B. Loginov, S.Yu. Stefanovich, 2018, published in Neorganicheskie Materialy, 2018, Vol. 54, No. 7, pp. 784–788.
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Politova, E.D., Mosunov, A.V., Strebkov, D.A. et al. Phase Formation and Phase Transitions in Nonstoichiometric Sodium Bismuth Titanate Ceramics. Inorg Mater 54, 744–748 (2018). https://doi.org/10.1134/S0020168518070154
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DOI: https://doi.org/10.1134/S0020168518070154