Mg粉、B粉按1.03:2的比例混合、压制成型后,在流通高纯氩气的条件下分别于660、700、750、800、850和900℃烧结1h,制备出MgB2块材.利用X射线衍射仪、扫描电子显微镜和阿基米德方法等,分别研究了样品的物相组成、显微结构和密度等.结果表明,随着烧结温度的升高,样品的非超导相Mg和MgBx(x=4、6或12)的含量、体积膨胀系数、质量损失率、密度及MgB2的晶粒尺寸都发生变化.750～850℃烧结时,可得到由MgB2和少量MgO组成、晶粒较小、密度较高的MgB2超导体.
参考文献
| [1] | Nagamatsu J;Nakagawa N;Muranaka T;Zenitani Y;Akimitsu J .Superconductivity at 39 K in magnesium diboride[J].Nature,2001(6824):63-64. |
| [2] | Bud'ko SL.;Petrovic C.;Cunningham CE.;Anderson N. Canfield PC.;Lapertot G. .Boron isotope effect in superconducting MgB2[J].Physical review letters,2001(9):1877-1880. |
| [3] | Finnemore DK.;Bud'ko SL.;Lapertot G.;Canfield PC.;Ostenson JE. .Thermodynamic and transport properties of superconducting (MgB2)-B-10[J].Physical review letters,2001(11):2420-2422. |
| [4] | Liu CF.;Yan G.;Du SJ.;Xi W.;Feng Y.;Zhang PX.;Wu XZ.;Zhou L. .Effect of heat-treatment temperatures on density and porosity in MgB2 superconductor[J].Physica, C. Superconductivity and its applications,2003(0):603-606. |
| [5] | Slusky,JS;Rogado,N;Regan,KA;Hayward,MA;Khalifah,P;He,T;Inumaru,K;Loureiro,SM;Haas,MK;Zandbergen,HW;Cava,RJ .Loss of superconductivity with the addition of Al to MgB2 and a structural transition in Mg1-x AlxB2.[J].Nature,2001(6826610):343-345. |
| [6] | Takano Y;Takeya H;Fujii H et al.[J].Applied Physics Letters,2001,78:2914. |
| [7] | Jung C U;Park M S;Kang W N et al.[J].Applied Physics Letters,2001,78:4157. |
| [8] | Gümbel A;Eckert J;Fuchs G et al.[J].Applied Physics Letters,2002,80:2725. |
| [9] | Tampieri A.;Celotti G.;Sprio S.;Caciuffo R.;Rinaldi D. .Study of the sintering behaviour of MgB2 superconductor during hot-pressing[J].Physica, C. Superconductivity and its applications,2004(3/4):97-104. |
| [10] | YAN Guo,FENG Yong,FU Baoquan,LIU Chunfang,JI Ping,ZHANG Pingxiang,ZHOU Lian.Supercondcuting properties in MgB2/Fe wires prepared by PIT method[J].科学通报(英文版),2003(13):1331-1333. |
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