Research on the monolithic process of making A-15 superconducting materials

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It is possible to produce high T/sub c/ wires or tapes from the V-Ga system by a monolithic process in which an ingot is cast as a supersaturated solution of V and Ga, homogenized at elevated temperature, quenched to preserve the supersaturation, formed into a wire or tape, and finally heat treated at a relatively low temperature to precipitate the superconducting phase. To achieve exceptionally high critical temperatures, the precipitation reaction must be carried out at temperatures below approximately 750/sup 0/C. The measured critical temperature then becomes a function of the aging time, and reaches a maximum value as high ... continued below

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Pages: 20

Creation Information

Hong, M.; Dietderich, D. & Morris, J.W. Jr. August 1, 1979.

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  • Lawrence Berkeley Laboratory
    Publisher Info: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
    Place of Publication: Berkeley, California

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Description

It is possible to produce high T/sub c/ wires or tapes from the V-Ga system by a monolithic process in which an ingot is cast as a supersaturated solution of V and Ga, homogenized at elevated temperature, quenched to preserve the supersaturation, formed into a wire or tape, and finally heat treated at a relatively low temperature to precipitate the superconducting phase. To achieve exceptionally high critical temperatures, the precipitation reaction must be carried out at temperatures below approximately 750/sup 0/C. The measured critical temperature then becomes a function of the aging time, and reaches a maximum value as high as 14.8/sup 0/K in alloys containing 17 to 19 at. % Ga. The reason for the exceptionally high critical temperature when the precipitation is carried out at lower aging temperatures is not established, but may be plausibly interpreted as due to a thermodynamic tendency for small precipitates formed from highly supersaturated solid solutions to be rich in solute content.

Physical Description

Pages: 20

Notes

Dep. NTIS, PC A02/MF A01.

Source

  • Cryogenic engineering conference, Madison, WI, USA, 21 Aug 1979

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  • Report No.: LBL-10007
  • Report No.: CONF-790815-33
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5583463
  • Archival Resource Key: ark:/67531/metadc1092535

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • August 1, 1979

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • April 24, 2018, 5 p.m.

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Hong, M.; Dietderich, D. & Morris, J.W. Jr. Research on the monolithic process of making A-15 superconducting materials, article, August 1, 1979; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1092535/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.