Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7990678 | Journal of Alloys and Compounds | 2018 | 19 Pages |
Abstract
MgB2/Ti/Cu single core wires were prepared by IMD or MIMD techniques using four different B powders. The MgB2 microstructure was analysed by XRD, SEM and TEM to correlate it to the purity and particle size of the B precursors and resulting wire superconducting properties. No direct relation was observed between the B powder particle size and MgB2 grain size. A small residual content of Cl of about 1â¯wt% in the B precursor did not influence the MgB2 phase as it did not change its critical temperature Tc. However, as a Cl-rich compound remained distributed in an inter-grain space, it significantly decreased the wire critical current density Jc and MgB2 compactness. A difference in the Jc of two similar Cl-free MgB2 wires was attributed to the presence of many stacking faults and low-angle boundaries in MgB2 grains, which can act as additional pinning centres.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
A. Rosová, I. HuÅ¡ek, M. Kulich, T. MeliÅ¡ek, P. KováÄ, E. DobroÄka, L. Kopera, J. Scheiter, W. HäÃler,