DocumentCode :
1123529
Title :
Flux Pinning Optimization of 
Bulk Samples Prepared Using High-Energy Ball B<sub>2</sub> was up to x = 0.10. Samples were removed from the WC jars after milling times up to 4000 minutes and formed into pellets using cold isostatic pressing. The pellets were heat treated in a hot isostatic press (HIP) at 1000degC under a pressure of 30 kpsi for 24 hours. The influence that milling time and TaB<sub>2</sub> addition had on the microstructure and the resulting superconducting properties of TaB<sub>2</sub>-added MgB<sub>2</sub> is discussed. Improvement of J<sub>c</sub> at high magnetic fields and of pinning could be obtained in milled samples with added TaB<sub>2</sub>. The sample with added 5at.%TaB<sub>2</sub> and milled for 300 minutes showed values of J<sub>c</sub>~ 7 times 10<sup>5</sup> A/cm<sup>2</sup> and F<sub>p</sub>~ 14 GN/m<sup>3</sup> at 2 T, 4.2 K. The milled and TaB<sub>2</sub>-mixed samples showed higher values of mu<sub>0</sub>H<sub>irr</sub> than the unmilled-unmixed sample.</div>
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<div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Keywords : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>ball milling; critical currents; crystal microstructure; electrical resistivity; flux pinning; heat treatment; hot pressing; magnesium compounds; superconducting critical field; superconducting materials; superconducting transition temperature; tantalum compounds; MgB<sub>2</sub>:TaB<sub>2</sub>; cold isostatic pressing; critical currents; critical temperature; doping; flux pinning optimization; grain connectivity; heat treatment; high-energy ball milling; microstructure; mixing concentration; nitrogen-filled glove box; prereacted powders; resistivity; superconducting properties; temperature 1000 C; time 24 hour; time 4000 min; upper critical field; <formula formulatype=)
${rm MgB}_{2}$ ; Addition of diborides; high-energy ball milling; microstructural and superconducting characterization;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2009.2018471
Filename :
5153177
Link To Document :
