Combined effect of Sn addition and post-rolling sintering on the superconducting properties of SmFeAsO1-xFx tapes fabricated by an ex-situ powder-in-tube process

Qianjun Zhang, Chunlei Wang, Chao Yao, He Lin, Xianping Zhang, Dongliang Wang, Yanwei Ma, Satoshi Awaji, Kazuo Watanabe

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11 Citations (Scopus)

Abstract

Polycrystalline Sn-added SmFeAsO1-xFx tapes were prepared by an ex-situ powder-in-tube method. It is found that the transport critical current density (Jc) of the SmFeAsO1-xF x tapes can be significantly improved with 10-30 wt. Sn addition. A transport Jc of 2.11 × 104 A cm-2 at 4.2 K in self-field was obtained in SmFeAsO1-xFx 30 wt. Sn sample. Most interestingly, Sn-added SmFeAsO1-xFx tapes without any sintering also showed substantial transport Jc of 9.81 × 103 A cm-2, which is reported for the first time. X-ray diffraction and scanning electron microscopy characterization revealed that the elemental Sn dispersed in the sample transformed into FeSn2 during the post-rolling sintering (PRS). The reaction between Sn and FeAs helps to eliminate the detrimental FeAs wetting phase, which blocks the supercurrent path between SmFeAsO1-xFx grains. The combined impact of fluorine loss and Sn reaction was discussed in this work by varying the Sn addition quantity and PRS condition.

Original languageEnglish
Article number123902
JournalJournal of Applied Physics
Volume113
Issue number12
DOIs
Publication statusPublished - 2013 Mar 28

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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