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Excess Mg addition wires with enhanced critical current density
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10.1063/1.2909203
/content/aip/journal/jap/103/8/10.1063/1.2909203
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/8/10.1063/1.2909203

Figures

Image of FIG. 1.
FIG. 1.

The field dependence of pulse current (PC) and direct current (dc) transport at 4.2, 10, and 20 K for normal stoichiometric and excess Mg wires: (a) PC and dc transport at 4.2, 10, and 20 K for samples treated at , (b) PC transport at 10 and 20 K for all samples, and (c) dc transport at 20 K for samples treated at for 1 h and at 700 and for 30 min.

Image of FIG. 2.
FIG. 2.

The x-ray diffraction patterns of the superconducting cores of Fe sheathed wires treated from 600 to : (a) normal stoichiometric samples and (b) Mg excess samples.

Image of FIG. 3.
FIG. 3.

The x-ray diffraction patterns of bulk samples treated from 650 to : (a) normal stoichiometric samples and (b) Mg excess samples.

Image of FIG. 4.
FIG. 4.

SEM images of normal samples treated at (a) , (b) , (c) , and (d) .

Image of FIG. 5.
FIG. 5.

SEM images of Mg excess samples treated at (a) , (b) , (c) , and (d) .

Image of FIG. 6.
FIG. 6.

Irreversibility field (, round symbols) and upper critical field (, square symbols) as a function of temperature for (a) normal and (b) Mg excess bulk samples sintered at a temperature range of .

Image of FIG. 7.
FIG. 7.

The normal-state resistivity as a function of temperature for (a) normal and (b) Mg excess samples processed at a temperature range of .

Tables

Generic image for table
Table I.

Comparison of FWHM, irreversibility field , and transport at 20 K, 4 T and at 10 K, 8 T for normal and excess Mg wires sintered at different temperatures.

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/content/aip/journal/jap/103/8/10.1063/1.2909203
2008-04-24
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Excess Mg addition MgB2/Fe wires with enhanced critical current density
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/8/10.1063/1.2909203
10.1063/1.2909203
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