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Ion transport in dual-phase SrFe1−xТаxO3−δ (x = 0.03 − 0.10): effects of redox cycling

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Abstract

The incorporation of tantalum cations in mixed-conducting SrFe1-xTaxO3−δ (x = 0.03 − 0.10) results in the formation of single cubic perovskite-like phases in oxidizing atmospheres while under reducing conditions phase separation is observed, accompanied with an appearance of brownmillerite-type nanodomains on the background of the perovskite-like matrix. For SrFe0.97Ta0.03O3−δ after reduction, the x-ray and electron diffraction studies combined with transmission electron microscopy evidence the formation of approximately 30 vol.% brownmillerite phase with an average domain size of 20–40 nm. The oxygen partial pressure dependencies of the total conductivity in the \( {p}_{{\mathrm{O}}_2} \) range from 10−20 to 0.5 atm at 700–950 °C show that the electron transport parameters remain virtually independent on the dopant content and domain structure. Contrary to the materials with higher dopant content, however, the ion conduction in SrFe0.97Ta0.03O3−δ tends to substantially increase on redox cycling. This behavior was attributed to the brownmillerite domain disintegration and rearrangement, induced by cyclic formation and disappearance of oxygen vacancies.

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Acknowledgments

The authors are grateful for the support of this work from the Russian Foundation for Basic Research (projects 13-03-00931 and 14-29-04042), the regional programs of the Ural Branch of RAS (12-Y-3-1005), the Ministry of Education and Science of the Russian Federation (project 14.B25.31.0018), and the FCT, Portugal (project PTDC/CTM-CER/114561/2009).

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Authors and Affiliations

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

    E. V. Shalaeva, M. V. Patrakeev, A. A. Markov, A. P. Tyutyunnik, I. A. Leonidov & V. L. Kozhevnikov

  2. Ural Federal University, 19 Mira Str., Ekaterinburg, Russia, 620002

    E. V. Shalaeva & A. M. Murzakaev

  3. Institute of Electrophysics, UB RAS, 106 Amundsen Str., Ekaterinburg, Russia, 620016

    A. M. Murzakaev

  4. Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, 3810-193, Aveiro, Portugal

    V. V. Kharton

  5. Institute of Solid State Physics RAS, Chernogolovka, Moscow District, Russia, 142432

    V. V. Kharton & E. V. Tsipis

  6. Centre of Mechanical Technology and Automation - TEMA, University of Aveiro, 3810-193, Aveiro, Portugal

    E. V. Tsipis

  7. Centro de Ciências e Técnicas Nucleares, Instituto Superior Técnico, Universidade Técnica de Lisboa, Estrada Nacional 10, 2695-066, Bobadela LRS, Portugal

    J. C. Waerenborgh

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  1. E. V. Shalaeva
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  2. M. V. Patrakeev
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  3. A. A. Markov
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  4. A. P. Tyutyunnik
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  5. A. M. Murzakaev
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  6. V. V. Kharton
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  7. E. V. Tsipis
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  8. J. C. Waerenborgh
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  9. I. A. Leonidov
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  10. V. L. Kozhevnikov
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Corresponding author

Correspondence to M. V. Patrakeev.

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Shalaeva, E.V., Patrakeev, M.V., Markov, A.A. et al. Ion transport in dual-phase SrFe1−xТаxO3−δ (x = 0.03 − 0.10): effects of redox cycling. J Solid State Electrochem 19, 841–849 (2015). https://doi.org/10.1007/s10008-014-2698-2

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  • DOI: https://doi.org/10.1007/s10008-014-2698-2

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