DocumentCode :
974968
Title :
Doping Effects of 
and 
on Critical Current Properties of 
Tapes
and on Critical Current Properties of TapesAuthor :
Yamamoto, Akiyasu ; Shimoyama, Jun-ichi ; Ueda, Shinya ; Horii, Shigeru ; Kishio, Kohji
Author_Institution :
Dept. of Appl. Chem., Univ. of Tokyo
Volume :
16
Issue :
2
fYear :
2006
fDate :
6/1/2006 12:00:00 AM
Firstpage :
1411
Lastpage :
1414
Abstract :
Doping effects of TiC and Mo2C on critical current properties and microstructures of MgB2 short tapes were systematically studied. Reduction of Tc and shortening of a-axis length were found to be derived from the substitution of carbon, independent of carbon source. Enhanced critical current properties under high magnetic fields were observed in the TiC, Mo2C doped samples. Grain growth of MgB2, which means a decrease of grain boundaries, i.e. reduction of effective pinning center density, was suppressed by TiC or Mo2C doping. Moreover, field dependence of Jc at low temperatures ~5 K was found to be strongly correlated with the actual carbon content of the MgB2 lattice. Our results suggest that control of actual carbon content in the MgB2 bulk is crucially important for improvement of Jc under magnetic fields
Keywords :
critical current density (superconductivity); doping; flux pinning; grain boundaries; grain growth; magnesium compounds; molybdenum compounds; superconducting tapes; titanium compounds; MgB2:Mo2C; MgB2:TiC; actual carbon content; carbon substitution; doping effects; effective pinning center density; enhanced critical current properties; grain boundaries; grain growth; magnetic field dependency; superconducting tape microstructure; Carbon compounds; Critical current; Doping; Flux pinning; Grain boundaries; Magnetic fields; Magnetic materials; Magnetic properties; Microstructure; Superconducting materials; Critical current properties; PICT method; flux pinning; impurity doping; magnesium diboride; microstructures;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2006.870449
Filename :
1643117
Link To Document :
