Abstract
MgB2 wires with iridium doping were manufactured using the in-situ
technique in a composite Cu-Nb sheath. Reaction was performed at 700°C,
800°C or 900°C for 1h in argon atmosphere. A maximum of about 1.5 at.%
Ir replaces Mg in MgB2. The superconducting transition temperature is slightly lowered by Ir doping. The formation of IrMg3 and IrMg4
secondary phase particles is evidenced, especially for a nominal
stoichiometry with 2.0 at.% Ir doping. The critical current density and
accommodation field of the wires are strongly dependent on the Ir
content and are generally weakened in the presence of Ir, although the
effect is less pronounced at lower temperatures.
Original language | English |
---|---|
Journal | Physica C: Superconductivity and its Applications |
Volume | 547 |
Pages (from-to) | 7-15 |
ISSN | 0921-4534 |
DOIs | |
Publication status | Published - 2018 |