Composition Profiles and Upper Critical Field Measurement of Internal-Sn and Tube-Type Conductors

Two standard internal-Sn type rod-in-tube (RIT) and two newly developed tube type conductors were investigated. Both types of strand were doped with Ta. A series of heat-treatments with varying temperature and duration time were performed to study their influence on the microstructure and properties...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2007-06, Vol.17 (2), p.2668-2671
Main Authors: Peng, X., Sumption, M.D., Dhaka, R., Bhatia, M., Tomsic, M., Gregory, E., Collings, E.W.
Format: Article
Language:English
Subjects:
Conductors
Cross sections
Energy measurement
Exact sciences and technology
Extrapolation
Heat treatment
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Internal-Sn
Magnetic analysis
Magnetic field measurement
Microstructure
Physics
Scanning electron microscopy
Scanning probe microscopes, components and techniques
Scanning transmission electron microscopy
Sn composition
Standards development
Strands
Superconductivity
Temperature
Transmission electron microscopy
transport properties
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Summary:Two standard internal-Sn type rod-in-tube (RIT) and two newly developed tube type conductors were investigated. Both types of strand were doped with Ta. A series of heat-treatments with varying temperature and duration time were performed to study their influence on the microstructure and properties. In this work, the fully reacted strands were analysed. Non-Cu J c was measured and B c2 values were estimated via Kramer plot extrapolation. B c2 values were also measured by resistive transitions at high magnetic fields, and compared with the values from Kramer plot extrapolations. High resolution scanning electron microscopy (SEM) was used to observe the cross-section and the composition across the strands' cross-section was measured by using energy dispersive spectroscopy (EDS). scanning transmission electron microscopy (STEM) was used to measure the composition variation in the individual filaments in the RIT strands. Superconducting properties were correlated to strand composition.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2007.899443