▎ 摘　　要

The effects of 0-5 wt.% reduced graphene oxide (rGO) addition on the superconducting properties of MgB2 bulks were investigated. We found that the dense and uniform MgB2 bulks were obtained by Mg diffusion method with rGO addition. The superconducting properties of MgB2 improved by the addition of rGO content of less than 2 wt.%. With more than 2 wt.% (including 2 wt.%) of rGO addition, nonsuperconducting phase MgB2C2 appeared and MgO content increased, which resulted in a decline in superconducting properties.