抄録
The addition of small amounts of Ag were found to dramatically promote the reaction of Mg and B powder to form MgB2 during low-temperature synthesis at 550°C and even at 500°C. Co-addition of Ag and SiC enabled C-substitution for MgB2, even for reactions at 550°C. Although the added Ag formed the Mg-Ag alloy after heat treatment, it was confirmed that Mg-Ag particles mainly existed at the edge of voids without losing their effective current path. In addition, Ag did not dissolve in the MgB2 phase. These conditions resulted in Tc and Jc performance as high as those where Ag-free MgB2 was synthesized at high temperatures. Furthermore, Ag-added MgB2 tapes were successively synthesized with high reproducibility by heating at 500°C for 24 h. Our results will contribute to the development of low-cost MgB2 materials.
