Dynamical characteristics of the degradation of superconducting properties in undoped and Ti-doped MgB2 by exposing to water

C. H. Cheng, Y. Zhao, Y. Feng, X. T. Zhu, N. Koshizuka, Masato Murakami

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Evolutions of diamagnetic magnetization (Mdia), critical current density (Jc) and irreversibility field (Hirr) for MgB2 have been investigated by changing the water-exposure time. The evolutions are found to follow a universal exponential law of AN(tR) = AN(0) exp(-tR/tN), where AN represents Mdia, Jc and Hirr for N = 1, 2 and 3, respectively, and tN is the corresponding time constant. When Mdia shows the most rapid decay with exposure time, Hirr exhibits the slowest degradation, with a difference between the decay-time constants of more than two orders of magnitude. For the case of Ti-doped MgB2, the exponential decay law can be still applied, but with a much longer decay-time constant. Microstructure analyses reveal that the grain boundaries of MgB2 are corroded by water when the exposing time is long enough. However, Ti doping significantly enhances the resistance to the corrosion of water.

Original languageEnglish
Pages (from-to)125-129
Number of pages5
JournalSuperconductor Science and Technology
Volume16
Issue number1
DOIs
Publication statusPublished - 2003 Jan
Externally publishedYes

Fingerprint

degradation
time constant
Degradation
Water
decay
water
Magnetization
Grain boundaries
Doping (additives)
Corrosion
critical current
corrosion
Microstructure
grain boundaries
current density
magnetization
microstructure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics

Cite this

Dynamical characteristics of the degradation of superconducting properties in undoped and Ti-doped MgB2 by exposing to water. / Cheng, C. H.; Zhao, Y.; Feng, Y.; Zhu, X. T.; Koshizuka, N.; Murakami, Masato.

In: Superconductor Science and Technology, Vol. 16, No. 1, 01.2003, p. 125-129.

Research output: Contribution to journalArticle

@article{298775e41817436aaaefe7531d332fc6,
title = "Dynamical characteristics of the degradation of superconducting properties in undoped and Ti-doped MgB2 by exposing to water",
abstract = "Evolutions of diamagnetic magnetization (Mdia), critical current density (Jc) and irreversibility field (Hirr) for MgB2 have been investigated by changing the water-exposure time. The evolutions are found to follow a universal exponential law of AN(tR) = AN(0) exp(-tR/tN), where AN represents Mdia, Jc and Hirr for N = 1, 2 and 3, respectively, and tN is the corresponding time constant. When Mdia shows the most rapid decay with exposure time, Hirr exhibits the slowest degradation, with a difference between the decay-time constants of more than two orders of magnitude. For the case of Ti-doped MgB2, the exponential decay law can be still applied, but with a much longer decay-time constant. Microstructure analyses reveal that the grain boundaries of MgB2 are corroded by water when the exposing time is long enough. However, Ti doping significantly enhances the resistance to the corrosion of water.",
author = "Cheng, {C. H.} and Y. Zhao and Y. Feng and Zhu, {X. T.} and N. Koshizuka and Masato Murakami",
year = "2003",
month = "1",
doi = "10.1088/0953-2048/16/1/322",
language = "English",
volume = "16",
pages = "125--129",
journal = "Superconductor Science and Technology",
issn = "0953-2048",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Dynamical characteristics of the degradation of superconducting properties in undoped and Ti-doped MgB2 by exposing to water

AU - Cheng, C. H.

AU - Zhao, Y.

AU - Feng, Y.

AU - Zhu, X. T.

AU - Koshizuka, N.

AU - Murakami, Masato

PY - 2003/1

Y1 - 2003/1

N2 - Evolutions of diamagnetic magnetization (Mdia), critical current density (Jc) and irreversibility field (Hirr) for MgB2 have been investigated by changing the water-exposure time. The evolutions are found to follow a universal exponential law of AN(tR) = AN(0) exp(-tR/tN), where AN represents Mdia, Jc and Hirr for N = 1, 2 and 3, respectively, and tN is the corresponding time constant. When Mdia shows the most rapid decay with exposure time, Hirr exhibits the slowest degradation, with a difference between the decay-time constants of more than two orders of magnitude. For the case of Ti-doped MgB2, the exponential decay law can be still applied, but with a much longer decay-time constant. Microstructure analyses reveal that the grain boundaries of MgB2 are corroded by water when the exposing time is long enough. However, Ti doping significantly enhances the resistance to the corrosion of water.

AB - Evolutions of diamagnetic magnetization (Mdia), critical current density (Jc) and irreversibility field (Hirr) for MgB2 have been investigated by changing the water-exposure time. The evolutions are found to follow a universal exponential law of AN(tR) = AN(0) exp(-tR/tN), where AN represents Mdia, Jc and Hirr for N = 1, 2 and 3, respectively, and tN is the corresponding time constant. When Mdia shows the most rapid decay with exposure time, Hirr exhibits the slowest degradation, with a difference between the decay-time constants of more than two orders of magnitude. For the case of Ti-doped MgB2, the exponential decay law can be still applied, but with a much longer decay-time constant. Microstructure analyses reveal that the grain boundaries of MgB2 are corroded by water when the exposing time is long enough. However, Ti doping significantly enhances the resistance to the corrosion of water.

UR - http://www.scopus.com/inward/record.url?scp=0037240860&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037240860&partnerID=8YFLogxK

U2 - 10.1088/0953-2048/16/1/322

DO - 10.1088/0953-2048/16/1/322

M3 - Article

AN - SCOPUS:0037240860

VL - 16

SP - 125

EP - 129

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

SN - 0953-2048

IS - 1

ER -