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A correlation between transport current density and grain connectivity in wire made from ball-milled boron
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10.1063/1.3129314
/content/aip/journal/jap/105/10/10.1063/1.3129314
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/10/10.1063/1.3129314

Figures

Image of FIG. 1.
FIG. 1.

Particle size distributions for (a) as-supplied (P96) and (b) ball-milled boron (BP96) powders.

Image of FIG. 2.
FIG. 2.

SEM images at two magnifications for (top) wire sample prepared from as-supplied boron, and (bottom) wire sample prepared from ball-milled boron. All samples were sintered at for 30 min.

Image of FIG. 3.
FIG. 3.

Transport critical current density for all wires as a function of external magnetic field at 4.2 K. The inset shows the field dependences of the magnetic critical current density at 5 K and 20 K with WPS800 and WBPS800.

Image of FIG. 4.
FIG. 4.

Compared to the increment of magnetic critical current density at 5 K and transport critical current density at 4.2 K under magnetic fields of 5–8 T with WPS800 and WBPS800. The inset shows the calculated active cross-sectional area fraction represents the connectivity factor with WPS650, WPS800, WBPS650, and WBPS800.

Image of FIG. 5.
FIG. 5.

The correlations between (a) the critical temperature and the RRR, and (b) the and the normalized resistivity .

Image of FIG. 6.
FIG. 6.

Temperature dependence of (a) the upper critical field and (b) the irreversibility field for wires as a function of sintering temperature and ball-milling condition.

Tables

Generic image for table
Table I.

The measured resistivity values, RRR, active cross-sectional area fractions , critical temperatures , and lattice strain for wire made from ball-milled boron and from as-supplied boron under comparable sintering conditions.

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/content/aip/journal/jap/105/10/10.1063/1.3129314
2009-05-27
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A correlation between transport current density and grain connectivity in MgB2/Fe wire made from ball-milled boron
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/10/10.1063/1.3129314
10.1063/1.3129314
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