Al掺杂对MgB_2结构的影响  

Al-DOPING EFFECTS ON THE STRUCTURAL OF MgB_2

作　　者：马金元[1] 孙爱民[1] 郑龙[1] 魏桂丹[1] 

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070

出　　处：《低温物理学报》2010年第4期273-277,共5页Low Temperature Physical Letters

摘　　要：本文采用改进的固相反应烧结法成功制备了一系列Mg1-xAlxB2(x=0.00～0.15)超导体,并对它们的成相、结构和超导特性作了研究.发现随着Al掺入量的增加晶格参数及临界转变温度都有减小的趋势.本文对此现象的产生原因作了分析,结果表明可能是由于Al原子引起的缺陷和Al2O3的生成及样品中Al分布不均匀所形成的MgAlB4共同影响了MgB2的结构,而MgB2结构的改变最终又引起它超导性的变化。In this paper,the improved solid-state reaction method successfully prepared a series of Mg1-xAlxB2（x =0.00～0.15）superconductors,and their structure,properties and superconducting transition temperature were studied.Found with the increase in Al lattice parameters andTcdecreased.In this paper,the cause of this phenomenon are analyzed,the impact of superconductivity may caused by the creation of defects by Al atoms and uneven distribution of MgAlB4 and generation Al2O3,the changes in the structure of MgB2 eventually led to its superconductivity of changed.

关 键 词：MGB2 AL掺杂 结构 超导性 

分 类 号：O511.2[理学—低温物理]