利用固相反应法分别在700℃和850℃制备了Mg1.05-x(Hg)xB2多晶样品,其中x=0,1%,2.5%,5%,7.5%,10%.X射线衍射结果显示,随着掺入量的增加,700℃制得的样品杂相较多,且MgB2的量随x的增大而减少.而在850℃下制备的样品只出现了少量的氧化镁和高硼相.与Ag和Pb掺杂样品不同,晶格常数随掺杂量的增大而增大.Hg掺杂导致MgB2晶格常数变大的同时,也使得MgB2的超导转变温度下降,从而使得其超导临界电流密度下降.
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(6824610):63-64. |
| [2] | Slusky JS;Rogado N;Regan KA;Hayward MA;Khalifah P;He T;Inumaru .Loss of superconductivity with the addition of Al to MgB2 and a structuraltransition in Mg1-xAlx[J].Nature,2001(6826):343-345. |
| [3] | Pissas M;Papavassiliou G;Karayanni M;Fardis M,Maurin L,Margiolak i I,Prassides K,Christides C .[J].Physical Review B,2002,65:184514. |
| [4] | Xiang J Y;Zheng D N;LiJ Q;Li L,Lang P L,Chen H,Dong C,Che G C,Ren Z A,Qi H H,Tian H Y,Ni Y M,Zhao Z X .[J].Physical Review B,2002,65:214536. |
| [5] | Soltanian S.;Horvat J.;Wang XL.;Munroe P.;Dou S. .Effect of nano-carbon particle doping on the flux pinning properties of MgB2 superconductor[J].Physica, C. Superconductivity and its applications,2003(3):185-190. |
| [6] | Cheng C H;Zhao Y;Zhu X T;Nowotny J,Sorrell C C,Finlayson T,Zhang H .[J].Physica C,2002,386:588. |
| [7] | Cheng C H;Zhao Y;Wang L;Zhang H .[J].PHYSICA C,2002,378-381:244. |
| [8] | M'chirgui A;Ben Azzouz F;Annabi M;Zouaoui M;Ben Salem M .Structure and superconductivity of Mg1-xPbxB2[J].Solid State Communications,2005(5):321-325. |
| [9] | Zhao YG.;Qiao PT.;Zhang HT.;Jia SL.;Cao BS.;Zhu MH.;Han ZH.;Wang XL.;Gu BL.;Zhang XP. .Effect of Li doping on structure and superconducting transition temperature of Mg1-xLixB2[J].Physica, C. Superconductivity and its applications,2001(2):91-94. |
| [10] | Zhao Y;Feng Y;Huang D X;Machi T,Cheng C H,Nakao K,Chikumoto N,Fudamoto Y,Koshizuka N,Murakami M .[J].Physica C,2002,378:122. |
| [11] | Dou SX;Braccini V;Soltanian S;Klie R;Zhu Y;Li S;Wang XL;Larbalestier D .Nanoscale-SiC doping for enhancing Jc and Hc2 in superconducting MgB2[J].Journal of Applied Physics,2004(12):7549-7555. |
| [12] | Wang J;Bngoslavsky Y;Berenov A et al.[J].Applied Physics Letters,2002,81:2026. |
| [13] | Chen S K;Wei M;MacManus-Driscoll J L .[J].Applied Physics Letters,2006,88:192512. |
| [14] | Pan X F;Shen T M;Li G et al.[J].Phys star sol,2007,204:1555. |
| [15] | Zhao YG.;Qiao PT.;Zhang HT.;Jia SL.;Cao BS.;Zhu MH.;Han ZH.;Wang XL.;Gu BL.;Zhang XP. .Influence of the starting composition Mg1-xB2 on the structural and superconducting properties of the MgB2 phase[J].Physica, C. Superconductivity and its applications,2001(1):1-5. |
| [16] | Lorenz B;Meng R L;Chu C W .[J].Physical Review B,2001,64:052513. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%