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刘浩然,金利华,杨芳,王庆阳,熊晓梅,冯建情,李成山,周廉.石墨烯掺杂MgB2块材超导性能和微观结构的研究[J].稀有金属材料与工程(英文),2019,48(4):1256~1259.[liuhaoran,jinlihua,yangfang,wangqingyang,xiongxiaomei,fengjianqing,lichengshan and zhoulian.Effect of graphene doping on the superconducting properties and microstructure of MgB2 bulks[J].Rare Metal Materials and Engineering,2019,48(4):1256~1259.]
Effect of graphene doping on the superconducting properties and microstructure of MgB2 bulks
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Received:September 04, 2017  Revised:November 20, 2017
Key words: superconducting material  MgB2  critical current density  flux pinning force
Foundation item:国家自然科学基金(51772250和51372207)项目, 陕西省自然科学NO.2017ZDJC-19
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liuhaoran,jinlihua,yangfang,wangqingyang,xiongxiaomei,fengjianqing,lichengshan and zhoulian  
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      Magnesium diboride (MgB2), which has the great technology advantage at 20-25 K and 1-3 T, is a promising material compared with other metallic superconductors and high-temperature superconductors due to its low cost raw material and without liquid helium. In order to meet the requirement of pratical applications, it is necessary to increase the superconducting properties of MgB2, so the flux pinning properties and intergrain connectivities have become the focus of researchers. In this work, MgB2 bulks with graphene, graphene-acetone solution, graphene coating B doping were synthesiszed and the microstructure, critical current density, flux pinning properties were studied systematically. The critical current density by graphene doping directly got significant enhancement at low field. However, the superconduting properties for samples synthesiszed by solution process and coating method did not improved obviously due to the oxidation decreased the activity of B powders.