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Phase transformation and superconducting properties of using ball-milled low purity boron
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Image of FIG. 1.
FIG. 1.

Scanning electron microscope (SEM) images of (a) B and (b) B. Inset shows a high magnification image of B.

Image of FIG. 2.
FIG. 2.

Differential thermal analysis for with different B powders.

Image of FIG. 3.
FIG. 3.

Scanning electron microscope (SEM) images for (a) B96, (b) BM4B96, (c) BM8B96, and (d) BM12B96.

Image of FIG. 4.
FIG. 4.

Particle size distribution for (a) B96, (b) BM4B96, (c) BM8B96, and (d) BM12B96.

Image of FIG. 5.
FIG. 5.

(a) - and -axis lattice parameters, (b) , (c) full-width at half-maximum (FWHM) of the (110) peak, and (d) lattice strain of samples using different B.

Image of FIG. 6.
FIG. 6.

Relative intensity, , as a function of ball-milling time. (Inset) Relative pinning force as a function of field for the different samples.

Image of FIG. 7.
FIG. 7.

The magnetic critical current density for all samples as a function of external magnetic field at 5 and 20 K.

Image of FIG. 8.
FIG. 8.

Kramer plot of the pinning force, , for all samples at 20 K.

Image of FIG. 9.
FIG. 9.

Temperature dependence of irreversibility field and upper critical field for all samples with different ball-milling times.


Generic image for table
Table I.

Measured resistivity values, residual resistivity ratios (RRR), and active cross-sectional area fraction for with different ball-milling times.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Phase transformation and superconducting properties of MgB2 using ball-milled low purity boron