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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.

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Authors and Affiliations

  1. Karpov Institute of Physical Chemistry (Russian State Scientific Center), ul. Vorontsovo pole 10, Moscow, 105064, Russia

    E. D. Politova, A. V. Mosunov, N. V. Golubko, G. M. Kaleva & S. Yu. Stefanovich

  2. Moscow State University, Moscow, 119992, Russia

    D. A. Strebkov & A. B. Loginov

  3. MIET National Research University of Electronic Technology, pl. Shokina 1, Zelenograd, Moscow, 124498, Russia

    B. A. Loginov

Authors
  1. E. D. Politova
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  2. A. V. Mosunov
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  3. D. A. Strebkov
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  4. N. V. Golubko
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  5. G. M. Kaleva
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  6. B. A. Loginov
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  7. A. B. Loginov
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  8. S. Yu. Stefanovich
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Correspondence to E. D. Politova.

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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

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