Preparation of MgB[sub 2] tapes using a nanocrystalline partially reacted precursor

Fischer, C.; Rodig, C.; Häßler, W.; Perner, 0.; Eckert, J.; Nenkov, K.; Fuchs, G.; Wendrock, H.; Hoizapfel, B.; Schultz, L.
September 2003
Applied Physics Letters;9/1/2003, Vol. 83 Issue 9, p1803
Academic Journal
Fe-cladded MgB[sub 2] conductors have been prepared by the powder-in-tube method using mechanically alloyed nanocrystalline Mg+2B powder mixtures consisting of the constituents Mg, B, and MgB[sub 2] as precursor. Despite low T[sub c] values of about 31 K, maximum critical current densities (J[sub c]) of 22 and 7 kA/cm[sup 2] in external magnetic fields of 7.5 and 10 T, respectively, are achieved at 4.2 K. These excellent values can mainly be attributed to the very fine-grained microstructure of the superconducting phase. Higher values have only been reported for tapes doped with SiC nanoparticles. The irreversibility fields H[sub irr] of these tapes are 9.5 and 4.2 T at 10 and 20 K, respectively. © 2003 American Institute of Physics.


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