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杨芳,刘浩然,王庆阳,熊晓梅,闫果,冯建情,李少强,李成山,冯勇.石墨烯掺杂和烧结温度对MgB<sub>2</sub>块体微观结构和超导性能的影响[J].稀有金属材料与工程(英文),2019,48(12):3819~3823.[Yang Fang,Liu Haoran,Wang Qingyang,Xiong Xiaomei,Yan Guo,Feng Jianqing,Li Shaoqiang,Li Chengshan and Feng Yong.Effect of graphene doping and sintering temperature on microstructure and superconducting properties of MgB<sub>2</sub> bulks[J].Rare Metal Materials and Engineering,2019,48(12):3819~3823.]
Effect of graphene doping and sintering temperature on microstructure and superconducting properties of MgB<sub>2</sub> bulks
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Received:June 04, 2018  Revised:September 28, 2018
DOI:
Key words: MgB<sub>2</sub>  doping  sintering  Microstructure  Critical current density
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Yang Fang,Liu Haoran,Wang Qingyang,Xiong Xiaomei,Yan Guo,Feng Jianqing,Li Shaoqiang,Li Chengshan and Feng Yong  
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Abstract:
      The effect of graphene doping on the microstructure and superconducting properties of MgB<sub>2</sub> bulks has been examined in comparison with the case of un-doped MgB<sub>2</sub>. The correlations among annealing temperatures, microstructures and superconducting properties in graphene doped MgB<sub>2</sub> bulks were investigated. The phase, microstructure and superconductivity of MgB<sub>2</sub> were characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and superconducting quantum interference device (SQUID). It is found that the grapheme doping results in an obviously improvement of the critical current density. The highest critical current density reaches 1.8×10<sub>5</sub>A/cm<sub>2</sub> at 20 K and 1 T.