NDLI: High Energy Milled Ex Situ MgB$_{2}$ as Precursor for Superconducting Tapes Without Critical Current Anisotropy

Content Provider	Springer Nature Link
Author	Kario, Anna Häßler, Wolfgang Rodig, Christian Schubert, Margitta Kováč, Pavol Melišek, Tibor Nast, Reiner Goldacker, Wilfried Holzapfel, Bernhard
Copyright Year	2012
Abstract	One lane of the present MgB$_{2}$ research is focused on scale-up of the conductor preparation for magnet applications. One limitation is the deformation of long length powder in tube conductors since the composite structure leads to a couple of complications. Therefore, a combination of various methods is commonly used: swaging, drawing, and flat rolling. In dense tapes deformed via distinct routes, a critical current anisotropy with respect to an external magnetic field is observed. The in situ method (unreacted Mg+B) is preferably used for conductor preparation, with the advantage offering more doping possibilities for the precursors to create flux pinning centers and to enhance the upper critical field and supporting a dense filament. In this work, we show in concurrence to the commonly preferred route, the possibility and potential of ex situ conductor preparation schemes, with the option of carbon doping, using high energy milling. Long multifilament tapes with 20 hours milled powder without carbon and with 5 wt% C were successfully deformed to wires and tapes. Tapes with 21 cores show critical current densities with J $_{c}$=10$^{4}$ A/cm$^{2}$ at B=8.8 T without any current anisotropy in different field-direction different to the case of the in situ conductors.
Starting Page	2337
Ending Page	2341
Page Count	5
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	25
Issue Number	7
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2012-06-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Superconductivity MgB$_{2}$ Tapes Anisotropy Characterization and Evaluation of Materials Strongly Correlated Systems, Superconductivity Condensed Matter Physics Magnetism, Magnetic Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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