Abstract
Nd2O3 dopedFe-sheathed MgB2 tapes with different doping levels were fabricated by the in situ powder-in-tubemethod, and their superconducting properties were studied systematically.The x-ray diffraction (XRD) patterns showed the main phase ofMgB2 along with the impurity phases such as MgO andNdB6 inthe Nd2O3 doped samples. Compared to the undoped tapes, the critical current densityJc of all the doped samples was improved with only a slight suppression of the critical temperatureTc, and the 5 at.%Nd2O3 doped tapes achievedthe highest Jc. Through the transmission electron microscope (TEM) study, nanoscale impurity particles were found inthe 5 at.% Nd2O3 doped samples, and they were thought to be responsible for the enhanced pinning behaviorand thus the increased critical current density.
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