Fabrication of (Ba, K)Fe2As2 tapes by ex situ PIT process using Ag-Sn alloy single sheath. (15th November 2016)

• Record Type: Journal Article
• Authors: Togano, K; Gao, Z; Matsumoto, A; Kikuchi, A; Kumakura, H
• Is Part Of: Superconductor science & technology. Volume 30:Number 1(2017:Jan.)
• Publication Date: 2016-11-15
• Subjects: superconducting wires and tapes -- (Ba -- K)Fe2As2 -- powder-in-tube (PIT) -- Ag-Sn alloy sheath -- critical current; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/30/1/015012
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: Instead of ordinal pure Ag, Ag-based Sn binary alloys (up to 7.5 at%Sn) with higher mechanical strength are used for the sheath material of ex situ powder-in-tube (PIT)-processed (Ba, K)Fe2 As2 (Ba-122) tapes. We found that the use of the Ag-Sn alloy enhances the densification and texturing of the Ba-122 core, resulting in higher transport, J c . Moreover, the optimum heat treatment temperature for a high J c can be lowered by around 100 °C due to the higher packing density of the Ba-122 core prior to the final heat treatment. We also found that the smoothness of the interface between the sheath and Ba-122 core is significantly improved by using the Ag-Sn binary alloy sheaths. These results show that the Ag-Sn alloy is promising as a sheath material in PIT-processed Ba-122 superconducting wires.