More recently, it has been reported that carbohydrate doping resulted in an effective substitution of carbon for boron in Mg B2, and hence achieved significant flux pinning enhancement. However, the authors found that the oxygen amount in carbohydrate additives played an important role in improving Jc -B performance in Mg B2. In this work, the effect of maleic anhydride (C4 H2 O3) and maleic acid (C4 H4 O4) dopants on the superconducting properties of in situ Mg B2 tapes has been studied. Compared to the undoped counterpart, both doped tapes showed an enhancement of Jc values by more than an order of magnitude in high-field region; however, the transport Jc of C4 H4 O4 doped tapes was apparently lower than that of C4 H2 O3 added samples. The poor grain connectivity as a result of more MgO and voids formed during the reaction in C4 H4 O4 doped samples can be responsible for the reduced Jc values.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)