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

研究成果: Article査読

7 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)125-129
ページ数5
ジャーナルSuperconductor Science and Technology
16
1
DOI
出版ステータスPublished - 2003 1 1
外部発表はい

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 凝縮系物理学
  • 金属および合金
  • 電子工学および電気工学
  • 材料化学

フィンガープリント

「Dynamical characteristics of the degradation of superconducting properties in undoped and Ti-doped MgB<sub>2</sub> by exposing to water」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル