In situ synthesis and superconducting properties of MgB2 fibers

J. H. Kim; H. R. Yoon; W. Jo; J. W. Kim; K. H. Kim

doi:10.1016/j.physc.2006.05.022

In situ synthesis and superconducting properties of MgB₂ fibers

J. H. Kim, H. R. Yoon, W. Jo, J. W. Kim, K. H. Kim

Department of Physics

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

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 ΔT_c < 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 H_c2 at 4 K is more than 16 T. In addition, a small amount of magneto-resistance is detected at high magnetic fields.

Original language	English
Pages (from-to)	793-796
Number of pages	4
Journal	Physica C: Superconductivity and its Applications
Volume	445-448
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physc.2006.05.022
State	Published - 1 Oct 2006

Bibliographical note

Funding Information:
This work has been supported by a grant from KEMCO and also supported by a grant from Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology, Republic of Korea. The work at SNU has been supported by the KRF by Korean Government (MOEHRD) (R08-2004-000-10228-0).

Keywords

MgB fiber
Resistance vs. temperature
Superconducting wire
Upper critical field

Access to Document

10.1016/j.physc.2006.05.022

Cite this

@article{7db403fe3eae485c85dd3d13d0fbf9dd,

title = "In situ synthesis and superconducting properties of MgB2 fibers",

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.",

keywords = "MgB fiber, Resistance vs. temperature, Superconducting wire, Upper critical field",

author = "Kim, {J. H.} and Yoon, {H. R.} and W. Jo and Kim, {J. W.} and Kim, {K. H.}",

note = "Funding Information: This work has been supported by a grant from KEMCO and also supported by a grant from Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology, Republic of Korea. The work at SNU has been supported by the KRF by Korean Government (MOEHRD) (R08-2004-000-10228-0).",

year = "2006",

month = oct,

day = "1",

doi = "10.1016/j.physc.2006.05.022",

language = "English",

volume = "445-448",

pages = "793--796",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - In situ synthesis and superconducting properties of MgB2 fibers

AU - Kim, J. H.

AU - Yoon, H. R.

AU - Jo, W.

AU - Kim, J. W.

AU - Kim, K. H.

N1 - Funding Information: This work has been supported by a grant from KEMCO and also supported by a grant from Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology, Republic of Korea. The work at SNU has been supported by the KRF by Korean Government (MOEHRD) (R08-2004-000-10228-0).

PY - 2006/10/1

Y1 - 2006/10/1

N2 - 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.

AB - 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.

KW - MgB fiber

KW - Resistance vs. temperature

KW - Superconducting wire

KW - Upper critical field

UR - http://www.scopus.com/inward/record.url?scp=33748202547&partnerID=8YFLogxK

U2 - 10.1016/j.physc.2006.05.022

DO - 10.1016/j.physc.2006.05.022

M3 - Article

AN - SCOPUS:33748202547

SN - 0921-4534

VL - 445-448

SP - 793

EP - 796

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1-2

ER -