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arXiv · 1405.6835

Enhancement of transport critical current density of SmFeAsO1-xFx tapes fabricated by an ex-situ powder-in-tube method with a Sn-presintering process

Qianjun Zhang·Chao Yao·He Lin·Xianping Zhang·Dongliang Wang·Chiheng Dong·Pusheng Yuan·Shaopu Tang·Yanwei Ma·Satoshi Awaji·Kazuo Watanabe·Yuji Tsuchiya·Tsuyoshi Tamegai
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Abstract

SmFeAsO1-xFx (Sm1111) tapes were prepared by an ex-situ powder-in-tube method with a Sn-presintering process. Scanning electron microscopy revealed apparent difference in microstructure between Sn-presintered tapes and the previously reported polycrystalline Sm1111 bulk, since Sn has reduced FeAs wetting phase and filled the voids between Sm1111 grains. The Sn-presintered tapes showed significant enhanced field dependences of transport Jc compared with Sn-added tapes. A highest transport critical current density (Jc) of 3.45x10^4 A cm-2 at 4.2 K and self-field is achieved. Magneto-optical (MO) imaging further confirmed large and well-distributed global and intergranular Jc in Sn-presintered Sm1111 tapes.

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Qianjun Zhang, Chao Yao, He Lin, Xianping Zhang, Dongliang Wang, Chiheng Dong, Pusheng Yuan, Shaopu Tang, Yanwei Ma, Satoshi Awaji, Kazuo Watanabe, Yuji Tsuchiya, Tsuyoshi Tamegai. 2014-05-27. Enhancement of transport critical current density of SmFeAsO1-xFx tapes fabricated by an ex-situ powder-in-tube method with a Sn-presintering process. https://doi.org/10.1063/1.4874261

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