Influence of heat-treatment schedules on magnetic critical current density and phase formation in bulk superconducting MgB2

被引：3

作者：

Bhatia, M

Sumption, MD

Tomsic, M

Collings, EW

机构：

[1] Ohio State Univ, Dept Mat Sci & Engn, LASM, Columbus, OH 43210 USA

[2] Hyper Tech Res Inc, Troy, OH 45373 USA

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2004年 / 415卷 / 04期

关键词：

D O I：

10.1016/j.physc.2004.07.009

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Various heat-treatment schedules have been applied to the optimization of T-c and J(c,m) in bulk MgB2. Samples were prepared by first mixing in a 'V' shaped mixer and then planetary milling a stoichiometric mixture of Mg and B powders. These powders were then compacted and heat-treated at different schedules under 200 Torr of Ar. The heat-treating schedules investigated involved different time-temperatures, heating rates, and cooling rates. Magnetic critical current densities (at 20 K) of more than 2 x 10(5) A/cm(2) in 10 kOe and 4 x 10(5) A/cm(2) in 5 kOe were obtained. The influence of sodium silicate additions on the bulk properties has been studied. (C) 2004 Elsevier B.V. All rights reserved.

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页码：158 / 162

页数：5

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