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Electrical Properties of Co-doped LaInO3 Perovskite

  • INORGANIC MATERIALS AND NANOMATERIALS
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Abstract

Co-doped LaInO3-based materials have been studied. Strontium-sustituted solid solutions have high conductivity values but exhibit a low level of oxygen deficiency. Mg2+ and Ca2+ ions have been selected as the B-sublattice co-dopant. Both series of the solid solutions—La0.9Sr0.1In1 – xCaxO2.95 – 0.5x and La0.9Sr0.1In1 – yMgyO2.95 – 0.5y—crystallize in orthorhombic symmetry with space group Pnma. Ionic conductivity in a dry atmosphere is determined by the transport of oxygen ions. Oxygen-ion transport in solid solutions is ~30–40% at high temperatures (T > 700°C) and increases to >80% when the temperature decreases to 400–300°C. The substitution of In3+ by Ca2+ makes it possible to increase the oxygen-ion electrical conductivity; the highest values are achieved for the compositions La0.9Sr0.1In0.95Ca0.05O2.925 and La0.9Sr0.1In0.9Ca0.1O2.9. The introduction of the Mg2+ co-dopant into the In3+ sites leads to a decrease in ionic electrical conductivity compared to La0.9Sr0.1InO2.95. The effects of changes in oxygen mobility with changes in geometric factors (cell volume, critical radius) are considered.

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Funding

The study was supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of the Development Program of the Ural Federal University named after the first President of Russia B.N. Yeltsin in accordance with the strategic academic leadership program “Priority 2030.”

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Authors and Affiliations

  1. Institute of High Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, 620002, Yekaterinburg, Russia

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

  2. Ural Federal University Named after the First President of Russia, B.N. Yeltsin, 620002, Yekaterinburg, Russia

    K. G. Belova, A. V. Egorova, S. P. Pachina, N. A. Tarasova & I. E. Animitsa

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  1. K. G. Belova
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  2. A. V. Egorova
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  3. S. P. Pachina
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  4. N. A. Tarasova
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  5. I. E. Animitsa
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Correspondence to A. V. Egorova.

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Translated by G. Kirakosyan

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Belova, K.G., Egorova, A.V., Pachina, S.P. et al. Electrical Properties of Co-doped LaInO3 Perovskite. Russ. J. Inorg. Chem. (2024). https://doi.org/10.1134/S0036023623602763

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  • DOI: https://doi.org/10.1134/S0036023623602763

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