Oxygen-ion and proton conductivity in the Ba 3 InGa 2 O 7.5  complex oxide with incomplete oxygen sublattice

Nadezhda Kochetova; Veronika Cherepanova; Alyona Pikalova; Artem Gilev

doi:10.15826/chimtech.2024.11.1.02

Oxygen-ion and proton conductivity in the Ba₃InGa₂O_7.5 complex oxide with incomplete oxygen sublattice

Nadezhda Kochetova, Veronika Cherepanova, Alyona Pikalova, Artem Gilev

Abstract

The Ba₃InGa₂O_7.5complex oxide, possessing the perovskite-related structure with structural oxygen vacancies, was first synthesized by the solid state method. The phase was found to be characterized by monoclinic symmetry (sp. gr. P2/c) with the following unit cell parameters: a = 7.942(1) Å, b = 5.868(5) Å, c = 18.201(6) Å, b = 91.52(9). Comprehensive investigations of electrical properties were carried out; ceramic material based on the complex oxide was shown to be a predominantly ionic conductor in the temperature range 450–900 ^oC. The conductivity is due to oxygen-ion transfer in dry conditions and oxygen-ion and proton transfer in wet atmosphere. The proton conductivity value is 4.5·10^–5 S/cm, and the proton transport number is ~50% at 700 ^oC in wet air; at lower temperatures, proton transport becomes dominant. Prolonged treatment of the sample in water vapors below 450 ^oC leads to hydrolysis decomposition.

Keywords

complex oxide; perovskite-like structure; structural oxygen vacancies; solid electrolyte; oxygen-ion conductivity; proton conductivity

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DOI: https://doi.org/10.15826/chimtech.2024.11.1.02

Copyright (c) 2023 Nadezhda Kochetova, Veronika Cherepanova, Alyona Pikalova, Artem Gilev

This work is licensed under a Creative Commons Attribution 4.0 International License.

Chimica Techno Acta, 2014-2024
ISSN 2411-1414 (Online)
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