Reactive nanostructured carbon as an effective doping agent for MgB2

被引：23

作者：

Gruner, W. ^{[1
]}

Herrmann, M. ^{[1
]}

Nilsson, A. ^{[1
]}

Hermann, H. ^{[1
]}

Hassler, W. ^{[1
]}

Holzapfel, B. ^{[1
]}

机构：

[1] Leibniz Inst Solid State & Mat Res, D-01171 Dresden, Germany

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2007年 / 20卷 / 07期

关键词：

D O I：

10.1088/0953-2048/20/7/003

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

AMgB(2-x)C(x) superconductor was prepared with reactive nanostructured carbon up to nominal x = 0.316 by high- energy ball milling. These products crystallize at temperatures below 700 degrees C, forming mainly MgB2-xCx with a particle size of about 20 nm and with lattice- dissolved carbon content up to about x = 0.13 under normal pressure conditions, and minor MgB4. The nominal higher addition of reactive nanostructured carbon does not have an influence on the a- axis of the MgB2-xCx structure. The superconducting behaviour reflects the optimum interplay of the lattice- dissolved carbon, which influences the carrier density, and the homogeneously distributed carbon, which probably acts as a pinning centre. For the sample with a nominal x = 0.221, the critical current density ( J(c)) increased by approximately one order of magnitude to J(c) = 1.7 x 10(4) A cm(-2) at 9 T and 4.2 K compared to the undoped MgB2.

引用

页码：601 / 606

页数：6

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