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Structure and dielectric properties of solid solutions Bi7Ti4 + x W x Nb1 − 2x O21 (x = 0–0.5)

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Abstract

The structural and electrophysical characteristics of a series of solid solutions of layered perovskite-type oxides Bi7Ti4 + x W x Nb1 − 2x O21 (x = 0–0.5) have been investigated. According to X-ray powder dif- fraction data, all the studied compounds are single-phase and have the structure of Aurivillius phases (m = 2.5) with an orthorhombic crystal lattice (space group I2cm, Z = 2). The changes in the tetragonal and orthorhombic distortions of perovskite-like layers in the compounds have been considered depending on their chemical composition. The temperature dependences of the relative permittivity ε(T) have been measured. It has been shown that the Curie temperature T C of the perovskite-type oxides Bi7Ti4 + x W x Nb1 − 2x O21 (x = 0–0.5) decreases linearly with an increase in the parameter x. The activation energies of charge carriers have been obtained in different temperature ranges. It has been found that there are three temperature regions with very different activation energies due to different natures of charge carriers in the studied compounds.

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Authors and Affiliations

  1. Research Institute of Physics, Southern Federal University, pr. Stachki 194, Rostov-on-Don, 344090, Russia

    V. G. Vlasenko, S. V. Zubkov & V. A. Shuvaeva

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  1. V. G. Vlasenko
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  2. S. V. Zubkov
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  3. V. A. Shuvaeva
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Correspondence to V. G. Vlasenko.

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Original Russian Text © V.G. Vlasenko, S.V. Zubkov, V.A. Shuvaeva, 2015, published in Fizika Tverdogo Tela, 2015, Vol. 57, No. 5, pp. 886–891.

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Vlasenko, V.G., Zubkov, S.V. & Shuvaeva, V.A. Structure and dielectric properties of solid solutions Bi7Ti4 + x W x Nb1 − 2x O21 (x = 0–0.5). Phys. Solid State 57, 900–906 (2015). https://doi.org/10.1134/S1063783415050327

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