NDLI: Role of the Grain Oxidation in Improving the In-Field Behavior of <formula formulatype=inline><tex Notation=TeX>${rm MgB}_{2}$</tex> </formula> <emphasis emphasistype=italic>Ex-Situ</emphasis> Tapes

Content Provider	IEEE Xplore Digital Library
Author	Vignolo, M. Romano, G. Malagoli, A. Braccini, V. Tropeano, M. Bellingeri, E. Fanciulli, C. Bernini, C. Honkimaki, V. Putti, M. Ferdeghini, C.
Copyright Year	2002
Abstract	The grain size and the grain boundaries play an important role in determining the pinning properties and the current carrying capability of MgB₂. Here we present an experimental study on the effect of grain oxidation on the superconducting properties of MgB₂ ex-situ Powder-in-Tube (PIT) tapes. We fabricated Fe-sheathed monofilamentary tapes using a variety of powders synthesized in inert (IA) or oxidizing (OA) atmosphere. In order to understand the role of magnesium oxide (MgO) we studied the effect of the presence of the oxidation layer on the field dependence of the critical current density. To this purpose, we developed a process for the powder synthesis and tube filling and sealing in controlled atmosphere to reduce the oxygen contamination; with this process the connectivity of the grains in the final tapes proved to be increased. Then, we introduced a controlled oxidation step. We will show how the presence of the MgO layer enhances the critical current field dependence. High energy X-ray diffraction measurements were performed on the samples, and the grain size of the unsintered and sintered powders in the tapes was measured by means of Scanning Electron Microscopy (SEM). The pinning force was studied, and different mechanisms were found for the samples prepared in IA and OA. The different behavior shown by the two different typologies of tapes was correlated with the presence or absence of the MgO layer.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2718
Ending Page	2721
Page Count	4
File Size	742414
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Oxidation Powders Grain size Atmosphere Energy measurement Pollution measurement Size measurement Scanning electron microscopy Grain boundaries Superconducting films pinning mechanism Critical current density inert atmosphere magnesium diboride magnesium oxide layer
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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