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The effect of phase composition on the transport properties of composites La0.8Sr0.2Fe0.7Ni0.3O3 − δ-Ce0.9Gd0.1O1.95

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Abstract

Full conductivity, diffusion and oxygen exchange processes in composites (100 − x)La0.8Sr0.2Fe0.7Ni0.3O3 − δ−xCe0.9Gd0.1O1.95 (x is the volume fraction, 0 ≤ x ≤ 71.1%) at 700°C over the oxygen partial pressure range from 0.2 to 3 × 10−3 atm are studied by the electrical conductivity relaxation method. The composites’ conductivity was shown to decrease monotonically with the increasing of Ce0.9Gd0.1O1.95 fraction, while the oxygen chemical diffusion coefficient increased. The oxygen exchange constant is higher for the composites than for the individual phases of La0.8Sr0.2Fe0.7Ni0.3O3 − δ and Ce0.9Gd0.1O1.95. Possible reason of the dependence of the parameters D chem and k chem on the temperature, oxygen pressure, and the composite composition is the effect of the interface on the oxygen transfer processes. Most effective oxygen transfer occurs in the composites whose composition approaches La0.8Sr0.2Fe0.7Ni0.3O3 − δ-Ce0.9Gd0.1O1.95 (x = 71%).

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Authors and Affiliations

  1. Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128, Russia

    Yu. S. Okhlupin & N. F. Uvarov

  2. Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 20, Yekaterinburg, 620219, Russia

    M. V. Ananyev

  3. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, ul. akad. Lavrent’eva 5, Novosibirsk, 630090, Russia

    Yu. N. Bespalko, S. N. Pavlova & V. A. Sadykov

Authors
  1. Yu. S. Okhlupin
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  2. M. V. Ananyev
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  3. N. F. Uvarov
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  4. Yu. N. Bespalko
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  5. S. N. Pavlova
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  6. V. A. Sadykov
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Correspondence to Yu. S. Okhlupin.

Additional information

Original Russian Text © Yu.S. Okhlupin, M.V. Ananyev, N.F. Uvarov, Yu.N. Bespalko, S.N. Pavlova, V.A. Sadykov, 2011, published in Elektrokhimiya, 2011, Vol. 47, No. 6, pp. 709–716.

After the paper delivered at the 10th Meeting “Basic Problems of Solid State Ionics”, Chernogolovka, 2010.

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Okhlupin, Y.S., Ananyev, M.V., Uvarov, N.F. et al. The effect of phase composition on the transport properties of composites La0.8Sr0.2Fe0.7Ni0.3O3 − δ-Ce0.9Gd0.1O1.95 . Russ J Electrochem 47, 663–670 (2011). https://doi.org/10.1134/S1023193511060097

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  • DOI: https://doi.org/10.1134/S1023193511060097

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