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In situ synthesis and superconducting properties of MgB2 fibers

Title
In situ synthesis and superconducting properties of MgB2 fibers
Authors
Kim J.H.Yoon H.R.Jo W.Kim J.W.Kim K.H.
Ewha Authors
조윌렴
SCOPUS Author ID
조윌렴scopus
Issue Date
2006
Journal Title
Physica C: Superconductivity and its Applications
ISSN
0921-4534JCR Link
Citation
vol. 445-448, no. 1-2, pp. 793 - 796
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Superconducting MgB2 fibers are grown by a diffusion method, in which B filaments are exposed to Mg vapor inside a folded Ta foil over a wide range of temperature and growth time. The as-grown wires with a diameter of about 110 μm are characterized by scanning electron microscopy and energy dispersive X-ray analysis. Surface morphology of the fibers turns out to be dependent on growth temperature and mixing ratio of Mg and B. Radial distribution of Mg ions into B is observed over the cross-sectional area. Transport properties of the MgB2 fibers are investigated in magnetic fields from 0 to 8 T by use of a physical property measurement system. MgB2 fibers grown at 900 °C for 2 h show a superconducting transition at 38.1 K with an onset temperature as 41.7 K and ΔTc < 3.03 K. Resistance of the MgB2 fiber at room temperature is 4 Ω and residual resistivity ratio (RRR) is estimated as 4.72. It is estimated that the upper critical field Hc2 at 4 K is more than 16 T. In addition, a small amount of magneto-resistance is detected at high magnetic fields. © 2006 Elsevier B.V. All rights reserved.
DOI
10.1016/j.physc.2006.05.022
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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