超导材料MgB_2的合成  

Synthesis of Superconducting MgB_2 Bulks

作　　者：周美玲[1] 梁锦霞[1] 刘敏[1] 沈金龙[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022

出　　处：《北京工业大学学报》2005年第2期186-188,209,共4页Journal of Beijing University of Technology

基　　金：国家"八六三"计划资助项目(99090211).

摘　　要：为了获得高纯度的MgB2块材,以Mg粉和B粉为原料,在流动的氢气中,用传统无压烧结方法成功地制备出MgB2块材.系统研究了传统无压烧结合成MgB2块材的工艺;重点讨论了制备过程中的各项参数对样品纯度的影响,包括烧结温度,保温时间,原料的配比等;并且找出了最佳的工艺参数.实验表明,当Mg和B的原子比为1:2≤n(Mg):n(B)≤1.2:2,烧结温度为750℃,保温3 h得到了成分单一的块材.样品的超导转变温度接近39K.To obtain high-purity MgR2 bulks, using magnesium powder and boron powder as starting materials, MgB2 bulks were successfully prepared by conventional pressureless sintering (PLS) method in the flowing argon atmosphere at the ambient pressure. We have systematically studied the process of synthesis of MgB2 and focused on discussing the effects of various parameters on impurity of the sample in the reaction including the sintering temperature, the sintering time and the ratio of starting materials and have obtained the optimal conditions. The experimental results show that MgB2 bulks with single component were fabricated at 750 ℃ for 3 hours when the ratio of Mg and B is 1:2≤n (Mg): n (B)≤1.2:2, and its Tc is near 39 K.

关 键 词：超导体 MGB2 传统无压烧结(PLS) 

分 类 号：TM26[一般工业技术—材料科学与工程]