THE COMBINED INFLUENCE OF SiC AND RARE-EARTH OXIDES DOPING ON SUPERCONDUCTING PROPERTIES OF MgB2 WIRES

摘要

Ti-sheathed MgB2 wires doped with different amount of nanosized rare-earth oxide (YD2O3, Gd2O3, and Dy2O3) and/or nanosized SiC were investigated. X-ray diffraction patterns suggested the existence of Mg2Si phase due to the SiC addition, while no any phase related to rare-earth oxide could be detected. Strong enhancement of in-field current carrying capability was observed on 2.5 wt.% Yb2O3 doped sample annealed at 800 °C. Dual doping with rare-earth oxide and SiC does not enhance J_C due to the negative effect caused by SiC addition.