High density nanocrystalline MgB2 bulk superconductors with improved pinning

被引：12

作者：

Gümbel, A

Perner, O

Eckert, J

Fuchs, G

Nenkov, K

Müller, KH

Schultz, L

机构：

[1] IFW Dresden, Inst Met Mat, D-01171 Dresden, Germany

[2] IBM SSD, Dept 5589, D-55131 Mainz, Germany

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2003年 / 13卷 / 02期

关键词：

mechanical alloying; MgB2; nanocrystalline material; pinning; superconductivity;

D O I：

10.1109/TASC.2003.812091

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We report on the synthesis of high density nanocrystalline MgB2 bulk samples with improved pinning via mechanical alloying of elemental Mg and B powders at ambient temperatures and hot pressing. The samples exhibit high j(c) at 20 K and 1 T, and an irreversibility line strongly shifted toward higher fields resulting in H-irr of about 0.8H(c2) (T) compared to H-irr (T) of about 0.5H(c2) (T) as typically observed for untextured conventional bulk specimens. The improved pinning of this material is attributed to the large number of grain boundaries in the nanocrystalline state.

引用

页码：3064 / 3067

页数：4

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