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In-field improvement by oxygen-free pyrene gas diffusion into highly dense superconductor
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10.1063/1.3532033
/content/aip/journal/jap/109/2/10.1063/1.3532033
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/2/10.1063/1.3532033

Figures

Image of FIG. 1.
FIG. 1.

Schematic of Mg diffusion method in combination with pyrene gas treatment used in study 1 and study 2. The sealed Ta tubes were vacuum-sealed in quartz tubes, sintered at for 4 min followed by annealing at for 24–48 h.

Image of FIG. 2.
FIG. 2.

(a) Real component of ac susceptibility with and at and (b) normalized temperature dependence of derived from ac susceptibility with , , and , 0.2, 0.5, 1, 3, and 5 T for C-containing gas treated samples and the un-doped reference sample.

Image of FIG. 3.
FIG. 3.

Magnetic field dependence of at 5 and 20 K for C-containing gas treated samples and the un-doped reference sample. The at 4.2 and 20 K for thin film is also included for comparison (Ref. 24 ).

Image of FIG. 4.
FIG. 4.

Microstructure of high-density bulk prepared from B powder sintered in oxygen-free C-containing gas: (a) BF-TEM image, (b) ADF-STEM image, (c) HAADF-STEM image, (d) edge map, and (e) edge map.

Tables

Generic image for table
Table I.

Results of Rietveld refinement on the high-energy SR powder diffraction data for C-containing gas treated samples and the undoped reference sample. The fitting quality between the observed pattern and the calculated one was evaluated by reliability factors , , and and goodness of fit .

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/content/aip/journal/jap/109/2/10.1063/1.3532033
2011-01-19
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: In-field Jc improvement by oxygen-free pyrene gas diffusion into highly dense MgB2 superconductor
http://aip.metastore.ingenta.com/content/aip/journal/jap/109/2/10.1063/1.3532033
10.1063/1.3532033
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