Abstract
The effects of Y2O3/SiC co-doping on impurities and superconducting properties of bulk MgB2 sample were investigated. The temperature range for the formation of YB4 was determined through thermal analysis of the sintering process. Y2O3 and nano-SiC addition improved the critical current density (J c) of bulk MgB2 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, Mg2Si and YB4 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.
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