MgB2超导体含碳掺杂研究进展  

RECENT PROGRESS ON MgB_2 SUPERCONDUCTIVITY DOPED BY CARBON AND CARBIDE

作　　者：张子立[1] 索红莉[1] 马麟[1] 高培阔[1] 王朝[1] 刘敏[1] 曹玲柱[1] 赵跃[1] 李亚明[1] 周美玲[1] 

机构地区：[1]北京工业大学材料学院,国家教育部功能材料重点实验室,北京100022

出　　处：《低温物理学报》2008年第3期187-193,共7页Low Temperature Physical Letters

基　　金：国家973计划(项目编号:2006CB601005);北京市自然科学基金(项目编号:2072004);国家教委全国百篇优秀博士论文专项资金(项目编号:200331));北京工业大学111人才工程资助的课题~~

摘　　要：MgB2超导体具有临界转变温度39K、原材料廉价及制备工艺简单等优点,被认为是MRI中已用超导体最好的替代者.但是临界电流密度(Jc)随外加磁场增大下降较快的这一问题极大的阻碍了其实际中的应用.实验结果表明:采取掺杂的方法来提高MgB2的超导电性尤其是高场下Jc值是一条有效的途径.本文概述了用单质碳和含碳化合物对MgB2超导体进行掺杂从而提高其超导特性的最新研究工作,具体介绍了掺杂物颗粒大小、掺杂量以及烧结温度等参数对MgB2超导电性的影响.研究表明:在碳单质掺杂中纳米级碳颗粒和碳纳米管具有比较好的掺杂性能,可以大幅度提高高场下的Jc值;在含碳化合物中,用纳米级SiC进行掺杂不仅可以大幅度提高高场下的Jc值,而且相比碳单质有更高的Tc值.根据目前的研究结果,最后本文对MgB2超导体掺杂研究的未来发展趋势进行了展望.MgB2 has the advantages such as 39 K transition temperature,low cost and facility of fabrication, and it is considered to be the best substitute of the superconductor used in MRI system. But MgB2 still has a big problem that the critical current density （Jc） depresses fast with the increase of the field. Doping is an effective way to enhance the Jc value at high field. In this paper, we present the recent progress on the study of the MgB2 doped by carbide and carbon, and summarize the effect of particle size, doping amount and the anneal temperature on the superconducting properties. It was found that the Jc value of the MgB2 was strongly enhanced in carbon （including nano carbon particle and nano carbon tube） doped samples. So far the SiC was found to be the best doping material, which not only improves the Jc value of MgB2 at high field, but also has less influence on the T drop of MgB2 than pure carbon doping. Based on the current literature results, lastly the further study and the prospective applications of MgB2 was proposed.

关 键 词：MGB2超导体 临界电流密度Jc 含碳掺杂 

分 类 号：TM26[一般工业技术—材料科学与工程] TN304.23[电气工程—电工理论与新技术]