低超导相含量MgB2-MgO复相超导材料特性研究  

Study on characteristics of MgB2-MgO composites with low fraction of superconducting phase

作　　者：冯大炎 牛晓龙[1] 张晴 周迪帆[1,2] 张义邴 Feng Dayan;Niu Xiaolong;Zhang Qin;Zhou Difan;Zhang Yibing(Department of Physics,College of Science,Shanghai University,Shanghai 200444,China;Shanghai Key Laboratory of High Temperature Superconductors,Shanghai 200444,China)

机构地区：[1]上海大学理学院物理系,上海200444 [2]上海市高温超导重点实验室,上海200444

出　　处：《低温与超导》2020年第11期32-35,共4页Cryogenics and Superconductivity

基　　金：上海市高温超导重点实验室(14DZ2260700)资助。

摘　　要：以Mg粉,B2O3粉,MgO粉为原料,用真空固相反应技术制备了一系列低超导相含量MgB2-MgO超导材料的样品,原料摩尔配比Mg:B2O3:MgO=4:1:x,其中,x=0,0.03,0.06,0.09,0.14,0.18,0.24,样品构成了MgB2-MgO超导-绝缘复相结构。实验表明,高含量MgO不会严重削弱MgB2超导电性,MgB2-MgO复相超导材料是研究MgB2弱连接效应和复相超导逾渗特性的理想材料。A series of samples of MgB2-MgO composites with low fraction of superconducting phase were prepared by vacuum solid-phase reaction technology using Mg powder,B2O3 powder and MgO powder as raw materials.The raw material ratio was Mg:B2O3:MgO=4:1:x,where x=0,0.03,0.06,0.09,0.14,0.18 and 0.24.The sample was composed of MgB2-MgO superconductor insulation multiphase structure.Experimental results indicate that high content of MgO will not depress too much the superconductivity of MgB2,MgB2-MgO composite superconductor is an ideal material for studying the weak link and percolation characteristics of MgB2.

关 键 词：复相超导材料 硼化镁 真空固相反应 超导电性 

分 类 号：O469[理学—凝聚态物理]