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Article Dans Une Revue Rare Metal Materials and Engineering Année : 2013

Influence of Nb Diffusion Layer on Superconductivity of MgB2/Nb/Cu Wires

Résumé

The MgB2 wires were prepared by in-situ Powder-in-Tube (PIT) method with Nb/Cu compounds tube as the sheath and then were heat treated at various temperatures for 2 h in flowing argon. The resistivity (R-T), magnetic moment (M-T), transport critical current (Ic-B) and magneto optical (MO) properties of MgB2 wires were analyzed. The results show that there is a diffusion layer between MgB2 superconducting core and Nb barrier layer when the heat-treatment temperature is higher than 750 °C, and this diffusion layer obstructs the current transfer into MgB2 superconductor core from the Cu sheath. This indicates that the best heat-treatment temperature for the MgB2 wires with Nb as the barrier layer should be lower than 750 °C.
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Dates et versions

hal-00984674 , version 1 (28-04-2014)

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Citer

Gaofeng Jiao, Chengshan Li, Guoqing Liu, André Sulpice, Qingyang Wang, et al.. Influence of Nb Diffusion Layer on Superconductivity of MgB2/Nb/Cu Wires. Rare Metal Materials and Engineering, 2013, 42 (5), pp.881-884. ⟨10.1016/S1875-5372(13)60060-0⟩. ⟨hal-00984674⟩

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