Microstructure, phase states, dielectric and elastic properties of ceramic solid solutions Li_0,17Na_0,83Nb_yTa_1-yO₃ obtained at high pressure

V.V. Efremov, O.B. Shcherbina, Yu.V. Radyush, M.N. Palatnikov
I.V. Tananaev Institute of Chemistry and Technology of the Federal Research Centre Kola Science Centre of the RAS
Scientific and Practical Center of the National Academy of Sciences of Belarus for Materials Science

DOI: 10.26456/pcascnn/2018.10.252

Abstract: Microstructure and elastic properties of ferroelectric ceramic solid solutions Li_0,17Na_0,83Nb_yTa_1-yO₃ with a perovskite structure were investigated, obtained by thermobaric synthesis at high pressures and temperatures. The electrical characteristics and phase states of a series of ferroelectric high-pressure solid solutions Li_0,17Na_0,83Nb_yTa_1-yO₃ ( y = 0,1 – 0,5 ) were investigated by the impedance spectroscopy method. Some anomalies are revealed in ε'(T) and σ_sv(T) dependencies associated with phase transitions in the studied ceramic samples. The values were established of the static conductivity as a function of the temperature and enthalpy of activation of charge carriers. It was found that Li_0,17Na_0,83Nb_yTa_1-yO₃ is a high-temperature superionic.
Keywords: solid ferroelectric high-pressure solutions, microstructure, Young’s modulus, impedance spectroscopy, dielectric permittivity, electrical conductivity.

Bibliography link:
Efremov, V.V. Microstructure, phase states, dielectric and elastic properties of ceramic solid solutions Li_0,17Na_0,83Nb_yTa_1-yO₃ obtained at high pressure / V.V. Efremov, O.B. Shcherbina, Yu.V. Radyush et al. // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials: Interuniversity collection of proceedings / Ed. by V.M. Samsonov, N.Yu. Sdobnyakov. – Tver: TSU, 2018. – I. 10. – P. 252-261.

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