Superconducting properties of Y2O3/SiC co-doped bulk MgB2
The effects of Y 2O 3/SiC co-doping on impurities and superconducting properties of bulk MgB 2 sample were investigated. The temperature range for the formation of YB 4 was determined through thermal analysis of the sintering process. Y 2O 3 and nano-SiC addition improved the critical current density (J c) of bulk MgB 2 sample at high field without significant degradation of superconducting transition temperature (T c), and the T c value was about 38 K. Besides boron dislocation caused by C substitution, Mg 2Si and YB 4 inclusions also contribute to the optimization of J c. In addition, minor flux jumps caused by low stability of magnetic flux occurred at a low field of 20 K and, together with weak intergranular connectivity, were responsible for inferior J c performance. Springer Science+Business Media, LLC 2011.