Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1820681 | Physica C: Superconductivity and its Applications | 2006 | 4 Pages |
Abstract
Bulk samples of MgxB2 with starting composition of 0.5 ⩽ x ⩽ 1.3 were prepared using a solid-state reaction route. Their structure and critical current density (Jc) were investigated. The experimental results show that the starting composition MgxB2, as well as the sintering temperature, has a significant influence on Jc and Hirr. The lattice parameter a increases with x and c shows a maximum value around x = 0.9. All the samples possess a Jc value about 106 A/cm2 in self-field for x > 0.5. However, at high magnetic field the Mg-deficient samples exhibit higher Jc values. The highest irreversibility field of Hirr = 5.2 T at 20 K was reached for x = 0.8 with sintering temperature of 800 °C, which is 0.8 T higher than that of the stoichiometric MgB2 sample. It is suggested that the formation of MgB4 nanoparticles is responsible for the increase of Hirr and Jc.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
G.J. Xu, R. Pinholt, J. Bilde-Sørensen, J.-C. Grivel, A.B. Abrahamsen, N.H. Andersen,