Electrochemical properties of Bi4Ti3 – x Cr x O12 – 0.5x (0.4 ≤ x ≤ 1.2) solid solutions with a layered perovskite structure

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....

Full description

Saved in:
Bibliographic Details
Published in:Russian journal of electrochemistry 2016-11, Vol.52 (11), p.1032-1040
Main Authors: Sekushin, N. A., Koroleva, M. S., Piir, I. V.
Format: Article
Language:English
Subjects:
Bismuth titanate
Chromium
Electric fields
Electrical resistivity
Electrochemical analysis
Frequency ranges
Perovskite structure
Perovskites
Solid solutions
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1023-1935
1608-3342
DOI:10.1134/S1023193516110100