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Influence of oxygen partial pressure on the kinetics of YBa2Cu3O7−x formation

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Abstract

The YBa2Cu3O7−x formation kinetics from a spray-roasted precursor powder containing Y2O3, BaCO3, and CuO was followed via in situ, time-resolved x-ray diffraction as a function of gas atmosphere and temperature. In inert atmospheres, BaCO3 and CuO form BaCu2O2 which subsequently reacts with Y2O3 to form YBa2Cu3O6. However, YBa2Cu3O6 decomposes at temperatures exceeding 725 °C with Y2BaCuO5 being one of the decomposition products. In oxidizing atmospheres, YBa2Cu3O7−x formation involves the BaCuO2. At high temperatures (800–840 °C), oxygen increases the yield of YBa2Cu3O6. A nuclei growth model assuming two-dimensional, diffusion-controlled growth with second-order nucleation rate fits the experimental data.

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Authors and Affiliations

  1. Department of Chemical Engineering and Texas Center for Superconductivity, University of Houston, Houston, Texas, 77204-4792, USA

    V. Milonopoulou, K. M. Forster, J. P. Formica, J. Kulik, J. T. Richardson & D. Luss

  2. Siemens, Madison, Wisconsin, 53719-1173, USA

    J. P. Formica

Authors
  1. V. Milonopoulou
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  2. K. M. Forster
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  3. J. P. Formica
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  4. J. Kulik
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  5. J. T. Richardson
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  6. D. Luss
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Milonopoulou, V., Forster, K.M., Formica, J.P. et al. Influence of oxygen partial pressure on the kinetics of YBa2Cu3O7−x formation. Journal of Materials Research 9, 275–285 (1994). https://doi.org/10.1557/JMR.1994.0275

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  • DOI: https://doi.org/10.1557/JMR.1994.0275

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