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熊晓梅,杨芳,王庆阳,闫果,冯建情,金利华,刘浩然,潘熙锋,郗丹,张平祥.不同包套石墨烯掺杂MgB2线材的超导性能研究[J].稀有金属材料与工程(英文),2019,48(4):1330~1335.[Xiong Xiaomei,Yang Fang,Wang Qingyang,Yan Guo,Feng Janqing,Jin linhua,Liu Haoran,Pan Xifeng,Xi Dan and Zhang Pingxiang.The superconducting properties research for different sheath MgB2 wiresdoped with graphene[J].Rare Metal Materials and Engineering,2019,48(4):1330~1335.]
The superconducting properties research for different sheath MgB2 wiresdoped with graphene
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Received:October 11, 2017  Revised:November 02, 2017
DOI:
Key words: MgB2 wire  barrier  graphene doping  critical current density
Foundation item:国家自然科学基金(51772250和51372207);国家重点研发计划(2017YFB0902303)
Author NameAffiliation
Xiong Xiaomei,Yang Fang,Wang Qingyang,Yan Guo,Feng Janqing,Jin linhua,Liu Haoran,Pan Xifeng,Xi Dan and Zhang Pingxiang  
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Abstract:
      Single filament MgB2/Fe(Nb)/Cu wires with or without graphene doping, using Fe and Nb as the diffusion layer, were fabricated by the in-situ PIT method. The heat treatment of sample is at 670~800 ℃ for 2 hours under high purity Ar atmosphere. X-ray diffraction pattern shows the main phase for the wires with heat treatment at 670℃ was whole MgB2 phase, except partial Fe2B impurity phase in Fe sheathed MgB2 wires. Microstructure analysis shows the hole between crystal grains in the wire without doping was bigger than that of Fe or Nb sheathed MgB2wire doped with graphene. Stress-strain test result shows the tensile strain value for the wire before heat treatment was lower than that of wires after heat treatment obviously. Hardenability of Fe sheathed wires was more sharpness. The strength was the maximum for Fe sheathed wires with or without heat treatment. Four probe transfer measurement properties show that the critical current density Jc of Nb sheated wire heat trwatment at 670 ℃ was higher than that of Fe sheated wire at 4.2 k with the field of 2 T,4 T and 6 T. Nb and Fe sheated MgB2 wires doped with graphene possess better transfer porformence at 2 T. The Jc value at 2 T was arrived at 4.5×105A/cm2 for Nb sheated wires. When the field is higher than 4 T, the Jc value of Nb and Fe sheated MgB2 wire doped with graphene was lower than that of undoped wire. The transfer property of Fe sheated wires reduce faster than that of other samples. This indicates that the dopants incompletly enter the crystal structure and led to the reduced flux pinning function at high field.