부산대학교 도서관

Carbon doping is studied in MgB2 pellets during one‐step synthesis by solid‐state reaction, employing both undoped and carbon‐doped boron with and without the addition of nano‐SiC. The phase formation during the synthesis as a function of time was followed using powder X‐ray diffraction and Rietveld refinement. The superconducting properties were characterized with a magnetometer to investigate doping‐induced changes. Mg(B1–xCx)2 is obtained with nano‐precipitates and different compositions depending on the synthesis temperature. It is found that the addition of nano‐SiC prevents the phase formation at low temperature (700°C). Nevertheless, the best superconducting properties are obtained for the sample treated at 900°C using simultaneously C and SiC, with a critical current density of 105 A cm−2 at 3 T and 20 K, named the 900‐20‐C‐nanoSiC sample. [ABSTRACT FROM AUTHOR]