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, M. 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 1
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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