Determination of different oxygen transport mechanisms and measurement of the oxygen ion conductivity of Y1Ba2Cu3O7−x |
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Authors: | J L MacManus Derek J Fray Jan E Evetts |
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Institution: | Department of Materials Science and Metallurgy, University of Cambridge, Pembroke St., Cambridge, CB2 3QZ, UK |
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Abstract: | By undertaking AC electrochemical impedance experiments on yttria stabilised zirconia electrolytes with polished Y1Ba2Cu3O7?x electrodes, the activation energy for oxygen ion transport within the bulk of Y1Ba2Cu3O7?x, in air, over the temperature range 823 K–1043 K, was determined to be 1.50 ± 0.05 eV. At 1000 K the oxygen ionic conductivity was calculated to be around one order of magnitude lower than that in yttria stabilised zirconia. Typical calculated values were σ=5×10?5 (ω cm)?1 and 6×10?3 (ω cm)?1 at the respective temperatures 823 K and 1043 K. By employing a similar cell but with Y1Ba2Cu3O7?x paste electrodes, oxygen transfer between the Y1Ba2Cu3O7?x and the electrolyte was found to occur via a surface diffusional processes. Over the temperature range 873 K–1098 K, in air, the activation energy for in-diffusion at the surface was found to be 1.4±0.1 eV and that for out-diffusion at the surface to be 1.76±0.05 eV. |
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