NDLI: Critical current and structure of Bi-2212 bulk oxides prepared by a diffusion process

Content Provider	IEEE Xplore Digital Library
Author	Yamada, Y. Hishinuma, Y. Yamashita, F. Wada, K. Tachikawa, K.
Copyright Year	2002
Abstract	Bi-2212 oxide superconductors have been synthesized by a diffusion process between a Sr-Ca-Cu oxide substrate and a Bi-Cu oxide coating layer. The substrate is formed into a shape of cylindrical rod 3 mm in diameter by CIP, and then sintered. The coating layer with Ag/sub 2/O addition is coated around the surface of the substrate rod. The heat treatment is performed at 820-860/spl deg/C to produce Bi-2212 diffusion phase. The Ag added to the coating layer enhances the diffusion reaction. The Bi-2212 diffusion layer, about 180 /spl mu/m in thickness, shows high density and oriented structure with plate-like grains. The transport I/sub c/ and J/sub c/ of the diffusion layer exceed 300 A and 2/spl times/10/sup 4/ A/cm/sup 2/, respectively, at 25 K and 0 T. The I/sub c/ decreases to about 100 A at 40 K and 0.5 T. Present investigation indicates that the bulk Bi-2212 oxide prepared by the diffusion process may be attractive for a current lead of cryocooler-cooled superconducting magnets.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1715
Ending Page	1718
Page Count	4
File Size	512658
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Critical current Coatings Superconducting magnets Diffusion processes Superconducting epitaxial layers Heat treatment Superconductivity Superconducting integrated circuits Thermal conductivity Powders
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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