NDLI: New Fabrication Process for <formula formulatype=inline> <tex>${hbox{Nb}}_{3}{hbox{Sn}}$</tex></formula> Conductors Through Diffusion Reaction Between Nb and Ag-Sn Alloys

Content Provider	IEEE Xplore Digital Library
Author	Matsumoto, G. Inoue, K. Kikuchi, A. Takeuchi, T. Kiyoshi, T.
Copyright Year	2002
Abstract	We investigated the superconducting properties of Nb₃Sn formed through the diffusion reaction between Nb and Ag-Sn alloys, including Ag-9at%Sn ductile fee phase and Ag-(12-16)at%Sn ductile zeta phase alloys, and Ag-24at%Sn brittle epsiv phase alloy. We fabricated single-core and multi-core composite wires by the rod-in tube and powder-in-tube processes. The composite wires were heat treated at 650-900degC to form Nb₃Sn filaments. With increase of Sn content in the Ag-Sn alloy cores, the superconducting properties of the Nb₃Sn composite wires were improved. T_c and Bc₂ (4.2 K) values for the Nb/Ag-Sn wires are similar to those for the Nb/Cu-Sn. However the Ic values are relatively small, due to their very thin Nb₃Sn layers below 0.4 mum. Ag is apparently not effective to increase the formation rate of Nb₃Sn layer. By using the 200- and 40000-core wires, T_c and B_c2 (4.2 K) values were increased by 0.5-1 K and 2-5 T, respectively for these multifllamentary wires, while from 10 to 500 times larger Ic (4.2 K) were obtained for the wires. The typical values for Tc and Bc2 (4.2 K) are 16.5-17.7 K and 16-21 T, respectively. The addition of 5at%Cu to Ag-Sn alloys improves their superconducting properties.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2580
Ending Page	2583
Page Count	4
File Size	761577
File Format	PDF
ISSN	10518223
Volume Number	17
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fabrication Niobium alloys Tin Superconducting filaments and wires Multifilamentary superconductors Superconducting materials Conductors Superconducting epitaxial layers Powders Multicore processing ${\rm Nb}_{3}{\rm Sn}$ multifilamentary conductor Ag-Sn alloy diffusion reaction of ${\rm Nb}_{3}{\rm Sn}$ effect of high Sn content
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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