Microstructure and current-voltage characteristics of bronzeprocessed niobium tin composites
Kimmich, R.
Hornung, F.
Rimikis, A.
Schneider, T.
Lee, P.J.
Inst. fur Tech. Phys., Forschungszentrum Karlsruhe ;
This paper appears in: Applied Superconductivity, IEEE Transactions on
Publication Date: Mar 2001
Volume: 11,
Issue: 1, Part 3
On page(s): 3675-3678
Meeting Date: 09/17/2000 - 09/22/2000
Location: Virginia Beach, VA, USA
ISSN: 1051-8223
References Cited: 13
CODEN: ITASE9
INSPEC Accession Number: 6948992
Digital Object Identifier: 10.1109/77.919862
Current Version Published: 2002-08-07
Abstract
Bronze route conductors are widely used for high field purposes.
To shift their limits to even higher fields it is decisive to understand
the role that microstructure plays in controlling the current-voltage
characteristic. Microstructural properties of Nb3Sn are
crucially determined by the reaction heat treatment. Therefore, several
heat treatments on samples of a commercial composite were performed. The
reaction temperatures extend from 600°C up to 750°C. SEM
micrographs were taken from filaments at different positions within the
samples. These micrographs were used to carry out a quantitative
analysis of grain size. To investigate the connection of microstructural
and electrical properties, resistive measurements of the current-voltage
characteristic at magnetic fields up to 15 T and 4.2 K were performed
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