Abstract
Single-core MgB2 composite wires have been made by the powder-in-tube method using commercial Mg, B andMgB2 powders (Alfa Aesar) in Fe, Nb and Ta tubes and both in situ and ex situ processes.Prepared wires were subjected to annealing at temperatures ranging from600 °C up to950 °C for 30 min in argonatmosphere. Resistive (R(T)) and transport current (Ic(μ0H)) measurements have shown how the sheath material that was used influences the criticaltemperature and critical current density. Inter-diffusion and reaction has been observedonly for the iron sheath. Niobium has appeared as the best sheath material forMgB2 wires made by the in situ process but as the worst sheath material for the ex situ method.The reason is mainly due to the large transversal cracks generated in the fully Nb sheathedex situ wires during the deformation, which are not healed by the subsequent heattreatment.
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