Ionic (O2– and H+) Transport in Oxygen-Deficient Perovskites La2Me+3ZnO5.5

A. V.  Egorova; Егорова А. В.; K. G. Belova; Белова К. Г.; N. V. Lakiza; Лакиза Н. В.; I. E. Animitsa; Анимица И. Е.

doi:10.31857/S0424857023040059

Ionic (O2– and H+) Transport in Oxygen-Deficient Perovskites La2Me+3ZnO5.5

Authors: Egorova A.V.¹^,2, Belova K.G.¹^,2, Lakiza N.V.², Animitsa I.E.¹^,2
Affiliations:
1. Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Science
2. Ural Federal University named after the first President of Russia B.N. Eltsin
Issue: Vol 59, No 4 (2023)
Pages: 200-207
Section: Articles
URL: https://journal-vniispk.ru/0424-8570/article/view/139259
DOI: https://doi.org/10.31857/S0424857023040059
EDN: https://elibrary.ru/AOCERQ
ID: 139259

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Abstract
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Abstract

The paper is devoted to the study of the conduction mechanism in perovskite phases with composition La2Me+3ZnO5.5 (Me+3 = Al3+, Sc3+, In3+). The phases were synthesized by a standard ceramic technique in the 700–1300°C temperature range. The structure of the La2InZnO5.5 and La2ScZnO5.5 samples is orthorhombic, while the La2AlZnO5.5 sample crystallizes in the cubic symmetry. The electrical conductivity of La2Me+3ZnO5.5 (Me+3 = Al3+, Sc3+, In3+) samples is studied as a function of temperature (200–900°C), oxygen partial pressure pO2, and humidity pH2O. The complex oxides are found to have a mixed type of conduction in air, the electronic contribution (the p-type conduction) increases with increasing temperature. The phases exhibit the dominant oxygen-ion transport at temperatures below 500°C. In wet atmosphere, Sc3+- and In3+-containing samples are capable of incorporating water from gas phase and forming proton defects. No significant proton transport in the La2AlZnO5.5 sample is realized. The partial conductivities σH+, σO2−, σh in a wide range of temperatures and рО2 are discussed.

Keywords

perovskite, electrolytes, partial conductivities, protonic transport, oxygen-ionic transport

References

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