[Zurück]

P. Kovàc, M. Reissner, T. Melisek, I. Husek, S. Mohammad:
"Current densities of MgB₂ wires by combined ex situ/ in situ process";
Journal of Applied Physics, 106 (2009), S. 013910-1 - 013910-7.

SiC doped MgB2 /Ti/Cu wires have been made by powder-in-tube technique using precursor prepared by mixing of MgB2 ex situ with Mg, B in situ in variable ex situ/in situ ratio. Wires containing 0%, 23%, 50%, 70%, and 100% of MgB2 powder were two axially rolled to 1.2 mm and annealed in Ar at temperatures 700-850 °C/ 0.5 h. Increased critical current density Jc 0H performance has been measured for 23% and 50% of added MgB2, which is attributed to improved grain connectivity combined with more effective grain boundaries acting as pinning centers. This novel process utilizes the advantages of both techniques: lower MgB2 porosity typical ex situ and better grain connectivity and effective C-substitution through SiC addition obtained by in situ.

http://dx.doi.org/10.1063/1.3158473

http://link.aip.org/link/?JAPIAU/106/013910/1