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Model for the oxygenation of the YBa2Cu3O7−x 90K superconductor

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Abstract

A model incorporating the thermodynamic equilibrium oxygen content, oxygen in-diffusion, and oxide phases for the oxygenation of the YBa2Cu3O7−x is described. For sintered polycrystals, grain growth and the resulting grain size distribution are included. The model is used to calculate the volume percent of each oxide phase for several processing conditions of sintered specimens and is compared with available results on the quantification of phases present. Such a comparison indicates that as the concentration of impurity phases increases so does the concentration of the less oxygenated 123 phases, suggesting that impurities coating 123 grains act as oxygen indiffusion barriers. The model is also used to investigate the uniformity of the oxygen content in large twinned and detwinned single crystals such as have been used for measuring superconductivity parameters.

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Authors and Affiliations

  1. Materials Science and Technology Division, Naval Research Laboratory, 20375-5343, Washington, DC

    H. A. Hoff, L. E. Toth, M. E. Filipkowski, C. L. Vold, S. H. Lawrence & R. A. Masumura

  2. SFA, Inc., 20875, Landover, MD

    W. L. Lechter

  3. Pennsylvania State University, 16802, University Park, PA

    D. K. Smith

Authors
  1. H. A. Hoff
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  2. L. E. Toth
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  3. M. E. Filipkowski
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  4. C. L. Vold
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  5. S. H. Lawrence
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  6. R. A. Masumura
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  7. W. L. Lechter
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  8. D. K. Smith
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Hoff, H.A., Toth, L.E., Filipkowski, M.E. et al. Model for the oxygenation of the YBa2Cu3O7−x 90K superconductor. J. Electron. Mater. 22, 1241–1249 (1993). https://doi.org/10.1007/BF02818067

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  • DOI: https://doi.org/10.1007/BF02818067

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