Electrochemical properties of Bi4Ti3 – xCrxO12 – 0.5x (0.4 ≤ x ≤ 1.2) solid solutions with a layered perovskite structure
- Authors: Sekushin N.A.1, Koroleva M.S.1, Piir I.V.1
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Affiliations:
- Institute of Chemistry, Komi Scientific Centre, Ural Branch
- Issue: Vol 52, No 11 (2016)
- Pages: 1032-1040
- Section: Article
- URL: https://journals.rcsi.science/1023-1935/article/view/188243
- DOI: https://doi.org/10.1134/S1023193516110100
- ID: 188243
Cite item
Abstract
Chromium-containing bismuth titanates Bi4Ti3–xCrxO12–δ (0 ≤ x ≤ 1.2) with a layered perovskite structure and with the number of layers in the perovskite-like unit m = 3 at x ≤ 0.5 and m = 4 at 0.5 < x ≤ 1.2 were synthesized by the solid state method. The electrochemical properties of Bi4Ti1.8Cr1.2O11.38 (m = 4) and Bi4Ti2.6Cr0.4O11.8 (m = 3) were studied by impedance spectroscopy and DC electric conductivity measurements in different gas media. The oxygen conductivity increased at temperatures (t) of 450–500°C. For the samples with m = 4 at t ≥ 500°C in the frequency range of the order of a few Hz, the imaginary part of impedance was inverted, which was explained by the electrochemical process on electrodes. At t ≥ 600°C a reversible breakdown of the Bi4Ti2.6Cr0.4O11.8 sample in an electric field of over 30 V/m was observed. It was concluded that the conductivity of Bi4Ti3–xCrxO12–δ is of electron-ion type.
About the authors
N. A. Sekushin
Institute of Chemistry, Komi Scientific Centre, Ural Branch
Author for correspondence.
Email: sekushin-na@chemi.komisc.ru
Russian Federation, Syktyvkar, 167982
M. S. Koroleva
Institute of Chemistry, Komi Scientific Centre, Ural Branch
Email: sekushin-na@chemi.komisc.ru
Russian Federation, Syktyvkar, 167982
I. V. Piir
Institute of Chemistry, Komi Scientific Centre, Ural Branch
Email: sekushin-na@chemi.komisc.ru
Russian Federation, Syktyvkar, 167982