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Synthesis of Superconducting Oxides and Oxide/Metal Composites by Oxidation of Metallic Precursors

  • Gregory J. Yurek (a1), John B. Vander Sande (a1) and David A. Rudman (a1)

Abstract

One method for the synthesis of superconducting oxides is high temperature oxidation of a metallic alloy (a metallic precursor) that contains the metallic constituents of the oxide. In addition, a noble metal can be added to the precursor such that, after oxidation, a two phase, finely divided oxide/metal composite results. Superconducting oxides have been produced from Eu-Ba-Cu and Yb-Ba-Cu alloys by oxidizing the alloys at 300°C followed by an “oxygen anneal” at elevated temperatures. Similarly, a Eu1,Ba2Cu3O7−x /Au composite has been formed from a quaternary metallic precursor. each case an onset of superconductivity occurred at about 92K. This approach to producing superconducting oxides is felt to have a number of advantages associated with it, not the least of which is the improvement of the mechanical properties of the superconducting product.

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1. Yurek, G. J., Vander Sande, J. B., Wang, W.-X., Rudman, D. A., Zhang, Y., and Matthiesen, M. M., Metall. Trans. A, 1987, vol. 18A, p. 1813.
2. Yurek, G. J., Vander Sande, J. B., Wang, W.-X., and Rudman, D. A., J. Electrochem. Soc, 1987, vol. 134, p. 2635.
3. Haider, R., Lu, Y. Z., and Giessen, B. C., Appl. Phys. Lett., 1987, vol. 51, p. 538.
4. Matsuzaki, K., Inone, A., Kimwia, H., Aoki, K., and Masumoto, T., Japan. J. Appl. Phy., 1987, vol. 26, p. L1310.

Synthesis of Superconducting Oxides and Oxide/Metal Composites by Oxidation of Metallic Precursors

  • Gregory J. Yurek (a1), John B. Vander Sande (a1) and David A. Rudman (a1)

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