DocumentCode :
1409452
Title :
Author :
da Silva, Lucas B. S. ; Rodrigues, Durval, Jr. ; Serrano, German D. ; Metzner, Vivian C V ; Malachevsky, Maria T. ; Serquis, Adriana
Author_Institution :
Dept. de Eng. de Mater., Univ. de Sao Paulo, Lorena, Brazil
Volume :
21
Issue :
3
fYear :
2011
fDate :
6/1/2011 12:00:00 AM
Firstpage :
2639
Lastpage :
2642
Abstract :
The discovery of superconductivity at 39 K in MgB2 has been catching the attention of scientists due to the possibility of applying the material in magnets and electronic devices operating with cryocoolers (temperatures around 20 K). In the present work, a methodology to optimize the critical current densities of this material is described. MgB2 bulk samples were prepared and analyzed with the addition of other diborides with the same C32 hexagonal structure as MgB2 (TaB2 , ZrB2 , VB2 , and AlB2 ) and with simultaneous addition of SiC. Microstructural characterization, performed using SEM+EDS and XRD, was extremely important to determine the distribution and compositional characterization of the superconducting phase. Magnetic superconducting characterization using SQUID was performed to determine the best material addition. As a result we could analyze the behavior of each addition on the current transport capacity, including an analysis of the magnetic flux pinning mechanisms.
Keywords :
X-ray chemical analysis; X-ray diffraction; alloying additions; aluminium compounds; critical current density (superconductivity); crystal microstructure; crystal structure; flux pinning; magnesium compounds; magnetic flux; scanning electron microscopy; silicon compounds; tantalum compounds; vanadium compounds; zirconium compounds; C32 hexagonal structure; EDS; MgB2 superconductors; MgB2-AlB2-SiC; MgB2-TaB2-SiC; MgB2-VB2-SiC; MgB2-ZrB2-SiC; SEM; SQUID; SiC; XRD; critical current densities; cryocoolers; diborides; magnetic flux pinning mechanism; magnetic superconducting characterization; microstructural characterization; superconducting phase; superconductivity; Carbon; Critical current density; Doping; Silicon carbide; Superconducting magnets; Temperature measurement; ${rm MgB}_{2}$ superconductors; Addition of diborides and SiC; crystallography; microstructure; superconducting properties;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2010.2092407
Filename :
5672793
Link To Document :
