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Impact of Humidity on Charge Transport in Proton-Conducting Perovskites AZr0.95Sc0.05O3 – α (A = Ca, Sr, Ba) Exposed to an Oxidative Atmosphere

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Abstract

The total, bulk, and grain boundary conductivities of proton-conducting zirconates of general formula AZr0.95Sc0.05O3 – α (AZS), where A = Ca, Sr, Ba, are measured in air with different humidity levels. The conductivity is measured using the four-probe dc method (600–900°C) and impedance spectroscopy (30–800°C). The impact of humid atmosphere on the total, bulk, and grain boundary conductivities of the AZS system is studied at different humidity levels: \({{p}_{{{{{\text{H}}}_{{\text{2}}}}{\text{O}}}}}\) = 0.04, 0.61, and 2.5 kPa. Humidity is found to have a considerable effect on the conductivity of our CaZS and BaZS at lower temperatures, suggesting the likelihood of hydronium ion-mediated transport.

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ACKNOWLEDGMENTS

For this study, we used facilities of the Center of Collective Use “Composition of Compounds”, Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences.

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Authors and Affiliations

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

    V. B. Balakireva, V. P. Gorelov, L. A. Dunyushkina & A. V. Kuz’min

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

    A. V. Kuz’min

Authors
  1. V. B. Balakireva
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  2. V. P. Gorelov
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  3. L. A. Dunyushkina
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  4. A. V. Kuz’min
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Correspondence to V. B. Balakireva.

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Translated by A. Kukharuk

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Balakireva, V.B., Gorelov, V.P., Dunyushkina, L.A. et al. Impact of Humidity on Charge Transport in Proton-Conducting Perovskites AZr0.95Sc0.05O3 – α (A = Ca, Sr, Ba) Exposed to an Oxidative Atmosphere. Phys. Solid State 61, 515–522 (2019). https://doi.org/10.1134/S1063783419040048

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