DocumentCode
1241686
Title
High density nanocrystalline MgB2 bulk superconductors with improved pinning
Author
Gümbel, A. ; Perner, O. ; Eckert, J. ; Fuchs, G. ; Nenkov, K. ; Müller, K.H. ; Schultz, L.
Author_Institution
Inst. for Metallic Mater., IFW Dresden, Germany
Volume
13
Issue
2
fYear
2003
fDate
6/1/2003 12:00:00 AM
Firstpage
3064
Lastpage
3067
Abstract
We report on the synthesis of high density nanocrystalline MgB2 bulk samples with improved pinning via mechanical alloying of elemental Mg and B powders at ambient temperatures and hot pressing. The samples exhibit high jc at 20 K and 1 T, and an irreversibility line strongly shifted toward higher fields resulting in Hirr of about 0.8Hc2(T) compared to Hirr(T) of about 0.5Hc2(T) as typically observed for untextured conventional bulk specimens. The improved pinning of this material is attributed to the large number of grain boundaries in the nanocrystalline state.
Keywords
critical current density (superconductivity); flux pinning; grain boundaries; magnesium compounds; mechanical alloying; nanostructured materials; superconducting critical field; type II superconductors; 1 T; 20 K; MgB2; grain boundaries; high density nanocrystalline MgB2; hot pressing; improved pinning; irreversibility line; mechanical alloying; Alloying; Grain boundaries; Inorganic materials; Milling; Plasma temperature; Powders; Pressing; Superconducting materials; Superconductivity; X-ray scattering;
fLanguage
English
Journal_Title
Applied Superconductivity, IEEE Transactions on
Publisher
ieee
ISSN
1051-8223
Type
jour
DOI
10.1109/TASC.2003.812091
Filename
1212269
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