| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1817725 | Physica C: Superconductivity and its Applications | 2015 | 5 Pages |
•Preparation of mechanically alloyed powders with a wide variation of the Mg:B-ratio.•Influence of this ratio on phase composition and on grain size of in bulk samples.•Increase of irreversibility field for Mg deficient samples.•Transport current density of wires is increasing considerably with Mg deficiency.
In this contribution the influence of the Mg:B-stoichiometry in the precursor on the structural and electrical properties of bulks and wires prepared with mechanically alloyed powder is discussed. The Mg to B ratio in the powder was varied in the range of x = 0.7 to 1.1 (MgxB2). Analysing the properties of bulks and wires prepared with such precursor powders it was found that Mg-deficiency can increase the amount of MgB2 phase, the MgB2 diffraction peak width, the irreversibility field and the critical current density considerably.
