Nb3Ge as a Potential Candidate Material for 15- to 25-T Magnets

  • M. R. Daniel
  • A. I. Braginski
  • G. W. Roland
  • J. R. Gavaler
  • A. T. Santhanam
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 24)

Abstract

The Nb3Ge compound is a promising candidate material for superconducting magnets in the 15- to 25-T range at 4.2 K. Preliminary work [1] on thin films of sputtered material revealed that this A15 superconductor possessed an upper critical field (H c2) around 37 T at 4.2 K and a critical temperature, T c , of 22 to 23 K. Measurements of the critical current density, J c , gave a value of 1 GA m−2 at 21 T and 4.2 K, the highest recorded value at this field. J c values in the range 0.5 to 1 GA m−2 at the operating field density and temperature are considered adequate for constructing a magnet. Therefore, Nb3Ge is indeed a promising material for very high field applications. Growth of Nb3Ge by chemical vapor deposition (CVD) lends itself readily to the manufacture of lengths of conductor in tape form. This work concentrates on the CVD material. Other fabrication techniques, such as electron beam evaporation or high-rate magnetron sputtering, could also be amenable to the production of lengths of tape conductor.

Keywords

Depression Coherence Expense Sapphire Tantalum 

Notation

H

magnetic field

Hc2

upper critical field

H

perpendicular magnetic field

H

parallel magnetic field

Jc

critical current density

Tc

transition temperature

Td

deposition temperature

Greek symbols

ΔTc

transition temperature width

ξ

coherence length

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Copyright information

© Springer Science+Business Media New York 1978

Authors and Affiliations

  • M. R. Daniel
    • 1
  • A. I. Braginski
    • 1
  • G. W. Roland
    • 1
  • J. R. Gavaler
    • 1
  • A. T. Santhanam
    • 1
  1. 1.Westinghouse R and D CenterPittsburghUSA

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