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

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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 \({{\sigma }_{{{{{\text{H}}}^{ + }}}}}\), \({{\sigma }_{{{{{\text{O}}}^{{2 - }}}}}}\), σh in a wide range of temperatures and рО2 are discussed.

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Authors and Affiliations

  1. Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia

    A. V. Egorova, K. G. Belova & I. E. Animitsa

  2. Ural Federal University named after the first President of Russia B.N. Eltsin, Yekaterinburg, Russia

    A. V. Egorova, K. G. Belova, N. V. Lakiza & I. E. Animitsa

Authors
  1. A. V. Egorova
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  2. K. G. Belova
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  3. N. V. Lakiza
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  4. I. E. Animitsa
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Correspondence to A. V. Egorova.

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The authors declare that they have no conflict of interest.

Supplementary Information

A.V. Egorova: https://orcid.org/0000-0002-3599-6552

K.G. Belova: https://orcid.org/0000-0003-0768-7039

I.E. Animitsa: https://orcid.org/0000-0002-0757-9241

Additional information

Translated by Yu. Pleskov

Based on the materials of the 16th International Meeting “Fundamental Problems of Solid State Ionics,” Chernogolovka, June 27–July 7, 2022.

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Egorova, A.V., Belova, K.G., Lakiza, N.V. et al. Ionic (O2– and H+) Transport in Oxygen-Deficient Perovskites La2Me+3ZnO5.5. Russ J Electrochem 59, 276–283 (2023). https://doi.org/10.1134/S1023193523040055

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