用自蔓延(SHS)法成功制备了MgB2超导块材.B,Mg合成MgB2是放热反应,预热温度和真空度是影响MgB2性能的主要因素,当预热温度太低时不能用电弧引导反应,理论计算和实验结果表明预热温度应该大于484 K,但预热温度太高会使部分MgB2分解为MgB4和MgB7,当预热温度为520K,真空度为2.4×10-3Pa时,试样的临界温度Tc=38.45K,温度转变宽度小于0.4 K,临界电流密度Jc=1.60×106A/cm2(10 K,0.5 T),1.65×106A/cm2(20 K,0 T).试样的致密度较低时,结构为层状,层与层之间有空洞,每层由颗粒状晶粒组成,颗粒尺寸为2 μm～5 μm.SHS法制备MgB2超导块材工艺简单、反应时间短(3 s～5 s).
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] | Liu Z K et al.[J].Applied Physics Letters,2001,78:3678. |
| [3] | Fan Z Y et al.[J].Applied Physics Letters,2001,79:87. |
| [4] | Zhai H Y et al.[J].Superconductor Science and Technology,2001,14:425. |
| [5] | Christen HM.;Cantoni C.;Paranthaman M.;Sales BC.;Rouleau C. Norton DP.;Christen DK.;Lowndes DH.;Zhai HY. .Superconducting magnesium diboride films with T-c approximate to 24 K grown by pulsed laser deposition with in situ anneal[J].Physica, C. Superconductivity and its applications,2001(3/4):157-161. |
| [6] | Bud'ko S L et al.[J].Physical Review Letters,1986,9:1877. |
| [7] | Collings E W et al.[J].稀有金属材料与工程,2002,31(06):5. |
| [8] | Takano Y et al.[J].Physics Letters,2001,78:2914. |
| [9] | Przybylski K.;Stobierski L.;Chmist J.;Kolodziejczyk A. .Synthesis and properties of MgB2 obtained by SHS method[J].Physica, C. Superconductivity and its applications,2003(1/2):148-152. |
| [10] | Merzhanov;Combustion A G .[J].Processes in Chemical Technology and Metallurgy,1975,1:16. |
| [11] | 叶大伦.实用无机物热力学数据手册[M].北京:冶金工业出版社,1981 |
| [12] | Xie Xu.[J].Chinese Journal of Low Temperature Physics,2001(04):241. |
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%