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New Ti-Sn Intermetallic Compound and ({\hbox {Nb}},{\hbox {Ti}})_{3}{\hbox {Sn}} Conductor

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5 Author(s)
Kikuchi, A. ; Nat. Inst. for Mater. Sci., Tsukuba, Japan ; Taniguchi, H. ; Yoshida, Y. ; Tomonaga, M.
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New Ti-Sn intermetallic compound of Ti2Sn3 could be easily synthesized at both of diffusion couple and powder mixture. It was found that Ti2Sn3 is very brittle and easily deformed to fine powders. This new high Sn-based compound could be used for an additional Ti and Sn source for the bronze processed (Nb,Ti)3Sn wires. The hybrid bronze processed wires are demonstrated with additional Ti2Sn3 modules in the bronze matrix. Significantly thick (Nb,Ti)3Sn layers were formed. Although Nb cores still remained in the center of filaments, (Nb,Ti)3Sn layers had no apparent gradient of Sn and Ti concentrations. We found the formation of (Cu,Nb)SnTi phases along (Nb,Ti)3Sn filaments. After heat treatment, no large Kirkendall voids were observed in the position filled up Ti2Sn3 powders. Fine tau1-CuSn3Ti5 precipitates are dispersed and they may behave as the reinforcement for the bronze matrix. It might resemble the effect of the ODS copper. The T c of hybrid bronze processed wires made with additional Ti2Sn3 modules is comparable with that of the commercially bronze processed wires, which is about 17.5 K.

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Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )