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Author(s): |
Qing-lin Xia, State Key Laboratory for Powder Metallurgy and School of Physics Science and Technology, Central South University, Changsha
Jian-hong Yi, State Key Laboratory for Powder Metallurgy and School of Physics Science and Technology, Central South University, Changsha
Yuan-dong Peng, State Key Laboratory for Powder Metallurgy and School of Physics Science and Technology, Central South University, Changsha
Hong-zhong Wang, State Key Laboratory for Powder Metallurgy and School of Physics Science and Technology, Central South University, Changsha
Cheng-shang Zhou, State Key Laboratory for Powder Metallurgy and School of Physics Science and Technology, Central South University, Changsha
Li-ya Li, State Key Laboratory for Powder Metallurgy and School of Physics Science and Technology, Central South University, Changsha |
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Abstract: |
Superconductor sample MgB2-XCuO(X=0, 3%, 5%) was synthesized from nano CuO, Mg and amorphous Boron powders by microwave heating in a short time. Powder X-ray diffraction (XRD) analysis indicates that the phases of the synthesis sample are MgB2 (major phase) and a small amount of MgO and Cu2Mg. Scanning electron microscope (SEM) observation shows that the MgB2 grain size is very small and the sample is tightness. The onset superconducting transition temperature of the MgB2-XCuO(X=0, 3%, 5%) samples measured by magnetization measurement are about 37.6 K, 36.56 K, 36.3 K. The critical current density Jc are calculated according to the Bean model from the magnetization hysteresis loop of the slab MgB2-XCuO(X=0, 3%, 5%) samples. In external magnetic field, the critical current density Jc of 3%CuO doped sample is the highest; in low external magnetic field, the critical current density Jc of 5%CuO doped sample is the lowest, while in higher external magnetic field, the critical current density Jc of undoped sample is the lowest.
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