Comparative study of different chemical doping effect on the Jc-B properties of MgB2 tapes

Abstract

The effect of chemical doping on the critical current density of MgB2 tapes is studied. As impurities, we tried silicides, carbon and organic compound. Most of them lead to an obviously improvement of critical current density (Jc), and weaken its field dependence. For the silicides addition, the reaction products, such as Mg2Si play an important role in the enhancement of flux pinning ability. For the doping of carbon containing impurities, carbon substitution to boron contributes significantly to the enhancement of flux pinning ability and upper critical field, and eventually improves the Jc-B performance of MgB2 tapes. By modifying starting materials preparation process and optimizing carbon source, further improvement of in-filed Jc is expected.