Effects of atmosphere and heating rate during processing of a ceramic superconductor [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: (31 pages) : digital, PDF file
- Additional Creators:
- Argonne National Laboratory
United States. Department of Energy
United States. Department of Energy. Office of Energy Research
National Science Foundation (U.S.)
United States. Department of Energy. Office of Scientific and Technical Information
- Properties of ceramic superconductors depend strongly on the temperature, heating rate, pressure, and atmosphere used during synthesis and fabrication. We have developed a process for synthesizing orthorhombic YBa₂Cu₃Oₓ (123) superconducting powders by calcining the precursor powders under reduced total oxygen pressure. The resultant 123 powders are mixed with organics, and wires and coils are fabricated by extrusion. The wires and coils are fired at a reduced total pressure in flowing O₂ to reduce the concentrations of CO₂, CO, and H₂O and thus prevent decomposition of the 123. Transport critical current density of the superconductor decreases drastically with increasing concentrations of CO₂ in the gas mixture. Transmission electron microscopy of materials sintered in O₂ atmospheres containing various levels of CO₂ clearly shows the extent of grain boundary degradation. 29 refs., 9 figs., 2 tabs.
- Published through SciTech Connect.
High-temperature superconductors: processing and microstructure property relationships, New Orleans, LA (USA), 17-21 Feb 1991.
Russell, R.A.; Zhang, C.; Gao, Y.; Balachandran, U.; Dusek, J.T.; Dorris, S.E.; Poeppel, R.B. . Materials and Components; Picciolo, J.J.; Xu, D.; Merkle, K.L. , Materials Science Div.; Selvaduray, G. . Dept. of Materials Engi.
- Funding Information:
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