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Ion conductivity of perovskites CaZr1 – x Sc x O3 – α (x = 0.03–0.20) in hydrogen-containing atmospheres

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Abstract

The total, proton, and oxygen conductivities in the CaZr1–x Sc x O3–α system (x = 0.03–0.20) were studied experimentally in the reductive atmospheres H2 + H2O + N2 in the temperature range 600–900°C. The electric conductivity and the transport numbers of ions and protons were measured using the direct current four-probe method and the EMF method with oxygen and water vapor concentration cells, respectively. The materials under study are pure proton-conductive below 700°C in these atmospheres; at higher temperatures, a pronounced contribution of oxygen conductivity appears. The isotherms of the total and partial conductivities are symbatic and have a maximum between x = 0.05 and x = 0.10, which correlates with the position of the boundary of the single-phase state.

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Authors and Affiliations

  1. Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620137, Russia

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

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

    A. V. Kuz’min

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

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Original Russian Text © V.P. Gorelov, V.B. Balakireva, A.V. Kuz’min, 2016, published in Elektrokhimiya, 2016, Vol. 52, No. 11, pp. 1206–1212.

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Gorelov, V.P., Balakireva, V.B. & Kuz’min, A.V. Ion conductivity of perovskites CaZr1 – x Sc x O3 – α (x = 0.03–0.20) in hydrogen-containing atmospheres. Russ J Electrochem 52, 1076–1081 (2016). https://doi.org/10.1134/S1023193516110069

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  • DOI: https://doi.org/10.1134/S1023193516110069

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