NDLI: Distribution of critical current density in large YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// grains fabricated using seeded peritectic solidification

Content Provider	IEEE Xplore Digital Library
Author	Dewhurst, C.D. Wai Lo Cardwell, D.A.
Copyright Year	2002
Abstract	High quality large grain high T/sub c/ superconducting ceramics offer enormous potential as "permanent" magnets and in magnetic screening applications at 77 K. This requires sample dimensions /spl sim/cm with uniform high critical current densities of the order 10/sup 5/ A/cm/sup 2/ in applied magnetic fields of 1T. We report a study of the magnetic characterisation of a typical large YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// grain, prepared by seeded peritectic solidification, and correlate the magnetically determined critical current density, J/sub c/, with microstructural features from different regions of the bulk sample. From this data we extract the temperature, field and positional dependence of the critical current density of the samples and the irreversibility line. We find that whilst the bulk sample exhibits a good J/sub c/ of order 10/sup 4/ A/cm/sup 2/ (77 K, 1T), the local J/sub c/ is strongly correlated with the sample microstructure towards the edge of the sample and more severely at the centre of the sample by the presence of SmBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// seed crystal.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1925
Ending Page	1928
Page Count	4
File Size	478491
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 density Yttrium barium copper oxide Magnetic flux Superconducting magnetic energy storage Crystalline materials Transmission line matrix methods High temperature superconductors Crystal microstructure Superconducting materials Magnetic materials
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Microstructure and Superconducting Behavior of ${hbox{YBa}}_{2}{hbox{Cu}}_{3}{hbox{O}}_{7-delta}$ Films Fabricated From Colloids of Nanoparticles

High trapped fields in melt-textured YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//

YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// bicrystal grain boundary T/sub c/ microstructure

Epitaxial growth of multilayered YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta///Y/sub 0.7/Ca/sub 0.3/Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// films for high current application

Trapped fields beyond 14 tesla in bulk YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//

Superconducting permanent magnets from bulk YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// samples

Limitation of DC currents by YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//-Au superconducting films

A model for calculating magnetic forces between monolithic YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// superconductors

Relationship between the surface resistance and crystal orientation of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// thin film

Distribution of critical current density in large YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// grains fabricated using seeded peritectic solidification

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YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// bicrystal grain boundary T/sub c/ microstructure

Epitaxial growth of multilayered YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta///Y/sub 0.7/Ca/sub 0.3/Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// films for high current application

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