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자연과학대학
물리학전공
Journal papers
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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
조윌렴
Issue Date
2006
Journal Title
Physica C: Superconductivity and its Applications
ISSN
0921-4534
Citation
Physica C: Superconductivity and its Applications vol. 445-448, no. 1-2, pp. 793 - 796
Indexed
SCI; SCIE; SCOPUS
Document Type
Article
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
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