Characteristics of a production route for filamentary Nb3Sn superconductors based on a reaction between niobium and Nb6Sn5

Neijmeijer, W.L. and Kolster, B.H. (1990) Characteristics of a production route for filamentary Nb3Sn superconductors based on a reaction between niobium and Nb6Sn5. Journal of the Less-Common Metals, 160 (1). pp. 161-170. ISSN 0022-5088

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Abstract:	Monofilamentary Nb3Sn superconductors have been made by application of a reaction between Nb6Sn5 powder and niobium. The layer thickness of Nb3Sn shows a parabolic time dependence, implying diffusion-controlled layer growth. The activation energy for diffusion is 268 kJ mol−1. The critical temperature Tc is about 17.5 K and the overall critical current density Jc is about 5 × 108 A m−2at 8 T, both after annealing at 675 °C. These values are comparable with those obtained for so-called ECN-type superconductors, which are based on a reaction between NbSn2 powder and niobium. An advantage of the use of Nb6Sn5 powder in comparison with NbSn2 is the kinetics of growth of Nb3Sn, which allows a lowering of the reaction temperature to 600–625 °C for filament diameters of about 30 μm.
Item Type:	Article
Copyright:	© 1990 Wiley
Link to this item:	http://purl.utwente.nl/publications/72790
Official URL:	http://dx.doi.org/10.1016/0022-5088(90)90118-4
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