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 (+1 others)
2014 Applied Physics Letters  
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
more » ... l 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.
doi:10.1063/1.4874261 fatcat:oagewez2wfeippei66zlubyzey