采用一种新的扩散法制备实用化的MgB2超导体  

The MgB_2 Bulks Prepared by a Modified Mg-Diffusion Method

作　　者：潘熙锋[1] C．H．Cheng 赵勇[1,2] 

机构地区：[1]磁浮技术与磁浮列车教育部重点实验室,西南交通大学超导研究开发中心,西南交通大学,四川成都610031 [2]School of Materials Science and Engineering, University of New South Wales, Sydney 2052, NSW, Australia

出　　处：《稀有金属材料与工程》2008年第A04期79-82,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50372052,50588201);国家重大基础研究项目(973)(2007CB616906)资助

摘　　要：利用一种新的Mg扩散方法,在常压下成功制备出致密的MgB2超导块材,样品密度最高达1.95g/cm3。结果表明:加热到900℃保温24h后炉冷,所得到的样品性能最佳。该样品在50Oe的外场下,超导转变温度(Tc)为38.1K,转变宽度仅0.9K;10K,20K,自场下临界电流密度(Jc)值分别达0.53,0.37MA/cm2。此外,通过添加少量纳米Pr6O11或者石墨,都能使MgB2的实用化性能得到显著改进。In this paper, we utilized a modified Mg-diffusion to prepare high packed MgB2 bulks with the high density, 1.95 g/cm^3 under ambient pressure. The results show the optimal heat-treated temperature is 900 ℃ for 24 h. The MgB2 prepared by the optimal conditions have superconducting transition temperature Tc of 38.1 K, and critical current density Jc of 0.53 and 0.37 MA/cm^2 at 10K, self-field and 20K, self-field, respectively. Additionally, after small quantity of nano-Pr6O11 or graphite doping, the applicable properties of MgB2 have been improved significantly.

关 键 词：MGB2 扩散法 临界电流密度 磁通钉扎 

分 类 号：TM26[一般工业技术—材料科学与工程]