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Effects of morphology of Mg powder precursor on the phase formation and superconducting properties of Mg11B2 low activation superconductor

Abstract

The effect of morphology of magnesium (Mg) powder on the phase formation and critical current density (Jc,) of sintered Mg11B2 bulk was studied. As a precursor for the formation of Mg11B2, the morphology spherical and plate-like of Mg powder were separately synthesized through the atomization and chemical reduction method reaction. From the differential thermal analysis of the sintering process, the solid-solid reaction of Mg11B2 sample using spherical Mg powder was confirmed to be much weaker than the plate-like one, and the second exothermic peak place is shift back and intensity is increased due to special microstructure of spherical Mg powder. The XRD analysis of Mg11B2 samples showed that the volume fraction of Mg11B2 in the sintered sample with plate-like Mg was higher than that with the spherical one, and for all the samples MgB2 is the main phase. The Mg11B2 sample using spherical Mg powder had two different kinds of microstructure owing to the difference of the diffusivity and the contact interface. The Jc values of Mg11B2 sample using spherical Mg powder enhanced in the entire field and it is even twice as high as that using plate-like Mg, and it is even better than all the Jc value reported in previous literature using the same kind of Mg powder as precursor.

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Publication details

The article was received on 12 May 2018, accepted on 04 Jul 2018 and first published on 04 Jul 2018


Article type: Paper
DOI: 10.1039/C8TC02300J
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Effects of morphology of Mg powder precursor on the phase formation and superconducting properties of Mg11B2 low activation superconductor

    F. Cheng, Z. Ma, L. Yu, C. Li, C. Liu, Q. Guo, H. Li, Y. Yamauchi, Y. Bando, Y. G. Alghamdi, A. A. Alshehri, M. S. Hossain and Y. Liu, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC02300J

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