Abstract:
The work demonstrates a method to tackle the agglomeration of Mg2Si dopant in chemical doping in
MgB2 superconductor to enhance its in-field critical current density. Mg-Si alloy which has uniformly
distributed Mg2Si particles in it is prepared by casting technique. The alloy is used as the Mg source for
the preparation of MgB2 samples doped with various weight percentage of nano carbon. XRD patterns
show peaks of Mg2Si in all Si containing samples. SEM images show a microstructure with distinctly
smaller grains and reduced crystallinity in doped samples. HRTEM analysis confirms that the method led
to better distribution of Mg2Si particles within the MgB2 grains as compared to the normally prepared
sample. It is found that doping has not severely affected the transition temperature of the samples and at
the same time enhanced the in-field critical current density.
