Properties of MgB2 wires made of oxidized powders

Single-core MgB2/Ti wires have been made from mixed (in situ) and intensively milled (mechanically alloyed) Mg + B powders. Both powders were oxidized at room temperature for 48 h and also by heat treatment at 400 degree C/1 h in air. Critical current density and resistivity measurements were perfor...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2012-07, Vol.477, p.20-23
Main Authors: KOVAC, P, KULICH, M, HAESSLER, W, HERMANN, M, MELISEK, T, REISSNER, M
Format: Article
Language:English
Subjects:
Applied sciences
Borides
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical current density
Critical currents
Electrical engineering. Electrical power engineering
Electrical resistivity
Exact sciences and technology
Intermetallic compounds
Magnesium compounds
Materials
Mechanical alloying
Oxidation
Physics
Properties of type I and type II superconductors
Superconductivity
Wire
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Summary:Single-core MgB2/Ti wires have been made from mixed (in situ) and intensively milled (mechanically alloyed) Mg + B powders. Both powders were oxidized at room temperature for 48 h and also by heat treatment at 400 degree C/1 h in air. Critical current density and resistivity measurements were performed for the samples with oxidized powders and also for those protected in glove box with high purity Ar. It was found that oxidation of in situ mixture is slightly decreasing critical current density. Surprisingly, the oxidation of much finer mechanically alloyed powder is improving Jc in spite of increased MgB2 resistivity. Jc at 10T increase by 47-100% was measured for mechanically alloyed powder oxidized at room temperature. This allows a safety handling with intensively milled Mg + B powders in air.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2012.02.026