Quantifying a partial polyamorphic transition in a cerium-based metallic glass during cooling

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

1 Scopus Citations
View graph of relations

Author(s)

  • Zhi Chen
  • Zhaoyue Sun
  • Fujun Lan
  • Xin Zhang
  • Ziliang Yin
  • Ye Liu
  • Zhidan Zeng
  • Hongbo Lou
  • Baolong Shen
  • Qiaoshi Zeng

Detail(s)

Original languageEnglish
Article number145901
Journal / PublicationJournal of Applied Physics
Volume130
Issue number14
Online published12 Oct 2021
Publication statusPublished - 14 Oct 2021
Externally publishedYes

Link(s)

Abstract

Cerium-based metallic glasses are prototype polyamorphous systems with pressure-induced polyamorphic transitions extensively reported. Cooling typically has a similar effect on materials as compression with regard to reducing volume. However, previous studies show dramatically different behavior of Ce-based metallic glasses between cooling and compression, whose origin remains unclear. Here, using in situ low-temperature synchrotron high-energy x-ray diffraction, the structural evolution of a Ce68Al10Cu20Co2 metallic glass is accurately determined and analyzed by a structure factor and a reduced pair distribution function (PDF) during cooling from 298 to 83 K. An unusually large linear thermal expansion coefficient is revealed, which is associated with both continuous but inconsistent structural changes between the two subpeaks of the first atomic shell in terms of average bond lengths and coordination numbers. These phenomena are suggested to be attributed to a gradual 4ƒ electron delocalization of only a minimal amount (∼2.6% at 83 K) of Ce atoms by quantitative analysis of the PDF data. However, a previously expected global polymorphic transition from a low-density amorphous state to a high-density amorphous state with an abrupt volume collapse is not observed. Moreover, electrical resistivity also shows a continuous increase during cooling without any sharp change. It is clarified that cryogenic temperatures could facilitate but are not powerful enough alone to trigger a global polymorphic transition in the Ce68Al10Cu20Co2 metallic glass, suggesting a wide distribution of its local atomic environment.

Research Area(s)

Citation Format(s)

Quantifying a partial polyamorphic transition in a cerium-based metallic glass during cooling. / Chen, Zhi; Sun, Zhaoyue; Lan, Fujun et al.
In: Journal of Applied Physics, Vol. 130, No. 14, 145901, 14.10.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

Download Statistics

No data available