Superconducting properties of MgB2 bulks using the different sizes of Mg & B raw powders

被引:0
|
作者
Chung, K. C. [1 ]
Jang, S. H. [2 ]
Oh, Y. S. [2 ]
Kang, S. H. [1 ]
Hwang, D. Y. [2 ]
机构
[1] Korea Inst Mat Sci, Chang Won 51508, South Korea
[2] Kiswire Adv Technol Ltd, Daejeon 34026, South Korea
来源
PROGRESS IN SUPERCONDUCTIVITY AND CRYOGENICS | 2020年 / 22卷 / 04期
关键词
MgB2; superconductor; critical current; morphology; powder size;
D O I
10.9714/psac.2020.22.4.020
中图分类号
O59 [应用物理学];
学科分类号
摘要
Among many variables in processing the high performance MgB2 bulk superconductors, simple and important approach is to optimize the size dependence of the Mg & B raw powders. The present study is dedicated towards the variation in superconducting properties of MgB2 depending upon the various combination of Mg & B powders with the two different particle sizes respectively. From morphological investigation of the MgB2 samples, narrow and long pores are observed when the larger Mg powders are used, whereas it is rather like the oval shapes with the smaller Mg powders. Also, it can be seen that the connectivity of the MgB2 samples is much enhanced with the smaller size of the B powders. J(c)-H properties of the MgB2 samples also indicate that the highest J(c) can be obtained when using the smaller size of the B powder with the combination of the smaller Mg powders than that of the larger Mg powders. If the cases with the larger B powers, it is more favorable to select the larger Mg powders with the better J(c)-H properties considering shorter diffusion length of Mg and more homogeneous mixture between the Mg & B powders.
引用
收藏
页码:20 / 23
页数:4
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