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High-temperature transport in perovskite-type Ca0.25Sr0.75Fe0.75Mo0.25O3 − δ

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Abstract

The comparative study of transport characteristics of SrFe0.75Mo0.25O3 − δ and Ca0.25Sr0.75Fe0.75Mo0.25O3 − δ was carried out in order to evaluate calcium substitution usability to improve functional properties of electrode materials based on SrFe1 − xMoxO3 − δ. The electrical conductivity in CaxSr1 − xFe0.75Mo0.25O3 − δ was measured as a function of oxygen partial pressure varying in the range of 10−21–0.5 atm at the temperature range of 750–950 °C. The thermogravimetric measurements have revealed that calcium substitution results in a decrease of oxygen content in SrFe0.75Mo0.25O3 − δ. The conductivity and oxygen content analysis has shown that calcium introduction in SrFe0.75Mo0.25O3 − δ provides about 30% conductivity increase under reducing conditions attributed to an increase in both concentration and mobility of n-type charge carriers. In contrast, hole conduction has been found unaffected by calcium content in CaxSr1 − xFe0.75Mo0.25O3 − δ. The improved electrical conductivity in Ca0.25Sr0.75Fe0.75Mo0.25O3 − δ under reducing conditions calls for testing this oxide as an anode material.

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Acknowledgments

The authors are grateful to the Russian Science Foundation (project 17-79-30071) for the support of this work.

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Authors and Affiliations

  1. Institute of Solid State Chemistry, UB RAS, 91 Pervomayskaya Str, 620990, Ekaterinburg, Russia

    O. V. Merkulov, A. A. Markov, I. A. Leonidov & M. V. Patrakeev

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  1. O. V. Merkulov
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  2. A. A. Markov
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  3. I. A. Leonidov
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  4. M. V. Patrakeev
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Correspondence to O. V. Merkulov.

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Merkulov, O.V., Markov, A.A., Leonidov, I.A. et al. High-temperature transport in perovskite-type Ca0.25Sr0.75Fe0.75Mo0.25O3 − δ. J Solid State Electrochem 23, 3165–3171 (2019). https://doi.org/10.1007/s10008-019-04412-4

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  • DOI: https://doi.org/10.1007/s10008-019-04412-4

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