Speaker
Description
For the high performance of the wires, cables, and further to the various magnet applications of MgB2 superconducting materials, the important issues have been addressed on the raw precursors of their purity, relative sizes, crystallinity, and the surface conditions including MgO and B2O3 impurities. Since in situ MgB2 superconducting wires have been fabricated using the reaction of Mg and B precursors, which were contaminated inevitably from the exposure to air during the fabrication process.
In this work, B2O3 impurities can be thoroughly removed and oxygen contents are much reduced through the chemical treatment conducted at room temperature, which is more effective compared to the thermal reduction process at higher temperature of 950oC for 48 hours. It was found that Tc values are even increased and high-field Jc at both 5 & 20 K were all enhanced with the common solvents like ethanol, methanol, acetone, and even water. In addition, it is worth mentioning that the Jc at low-fields are also enhanced when the boron precursor are treated chemically with the solvents of ethanol and acetone than that of pure MgB2
