The performance improvement of MgB2 prepared by the Mg diffusion method with the MgB4 addition

29th International Symposium on Superconductivity

Zhang, H.^1 ; Li, L.^1 ; Zhao, Y.^1,2 ; Zhang, Y.^1

Key Laboratory of Maglev Train and Maglev Technology, Ministry of Education, Superconductivity and New Energy RandD Center, Southwest Jiaotong University, Chengdu

610031, China^1

School of Physical Science and Technology, Southwest Jiaotong University, Chengdu

610031, China^2

关键词: Application performance;    Argon atmospheres;    Diffusion method;    Lattice distortions;    Performance improvements;    Processing parameters;    Superconducting critical temperatures;    Superconducting properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012057/pdf
DOI  :  10.1088/1742-6596/871/1/012057

来源: IOP

【 摘 要 】

The Mg diffusion method with the MgB4addition is carried out to improve the MgB2application performance. The precursor B powders and MgB4powders are uniformly mixed as the ratio of (1- 4x) : x mol %, (x = 0, 1, 2, 5, 10 and 20). The mixed powders are pressed into bulks and the excess of Mg powders are added into the iron pipe. Then the heat treatment is carried out under the pure argon atmosphere. Finally, the high-quality MgB2bulks are achieved with high density. The superconducting critical temperature of the MgB2bulks decreases slightly with the increase of MgB4addition content. However, the critical current density increases significantly at the high-fields. It is perhaps due to the small-sized MgB4impurities in MgB2bulk function as effective pinning centers and generates significant lattice distortion in the MgB2lattice to yield improved Jcperformance in the applied field. It suggests that further improvement in the superconducting properties of the MgB2added with the MgB4will be possible via a better control of the composition and processing parameters. This also provides a reference for improving the preparation of MgB2wire.