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Ceramic Solid Solutions of Li0.17Na0.83TayNb1 –yO3: Thermobaric Synthesis, Microstructure, and Properties

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Abstract

Ferroelectric ceramic LixNa1 –xTayNb1 –yO3 (x = 0.17, y = 0–0.5) solid solutions with perovskite structure are synthesized for the first time by the thermobaric synthesis method (6 GPa, 1400–1800 K). The features of their structure and elastic properties are studied. It is shown that ceramic samples consist of grains of isomorphic shape and that faceting is inherent in the perovskite structure, allowing the coexistence of the rhombic phase of different symmetries of the P21ma and Pbcm unit cell. An increase in the synthesis temperature leads to a decrease in the Young’s modulus. The dispersion of the permittivity and its temperature dependence are studied. Specific static values of electrical conductivity and their temperature dependence, as well as the most probable relaxation time, are determined. Carrier activation enthalpies Ha and transport enthalpy Hm are calculated. It is established that the studied ceramic samples undergo a ferroelectric phase transition, while an increase in tantalum concentration lowers the Curie temperature. Li0.17Na0.83Та0.1Nb0.9O3 in the paraelectric phase is found to be a superionic conductor.

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Funding

This study was supported by the Russian Foundation for Basic Research, project no. 18-33-00099/19.

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Authors and Affiliations

  1. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Federal Research Center Kola Science Center of the Russian Academy of Sciences, 184209, Apatity, Russia

    V. V. Efremov, O. B. Shcherbina & M. N. Palatnikov

  2. Scientific-Practical Materials Research Center, National Academy of Sciences of Belarus, 220072, Minsk, Belarus

    Yu. V. Radyush

Authors
  1. V. V. Efremov
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  2. O. B. Shcherbina
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  3. M. N. Palatnikov
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  4. Yu. V. Radyush
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Correspondence to V. V. Efremov.

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Translated by N. Saetova

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Efremov, V.V., Shcherbina, O.B., Palatnikov, M.N. et al. Ceramic Solid Solutions of Li0.17Na0.83TayNb1 –yO3: Thermobaric Synthesis, Microstructure, and Properties. Tech. Phys. 65, 896–903 (2020). https://doi.org/10.1134/S1063784220060109

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