Change in local environment upon quasicrystallization of Zr-Cu glassy alloys by addition of Pd and Pt

Junji Saida, Takashi Sanada, Shigeo Sato, Muneyuki Imafuku, Masato Ohnuma, Tadakatsu Ohkubo, Kazuhiro Hono, Eiichiro Matsubara

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The effects of Pd and Pt, which are known quasicrystal (QC)-forming elements, on the local atomic structure in Zr70Cu30 glassy alloys are investigated. A QC phase precipitates from a glassy phase above a certain temperature by a cooperative-like motion of icosahedral clusters. Quasicrystallization is accompanied by a significant change in the local environment around the Zr atoms and a slight change around the noble metal. However, the local environment around the Cu atoms remains almost the same during QC formation. It is suggested that two types of icosahedral polyhedra exist in the glassy state: one has a relatively perfect icosahedral structure formed around the Zr atoms. The other is in a distorted state around the Cu atoms. We speculate that the medium-range order (i.e.QC nucleus) has a Zr-centered icosahedral cluster as its core, and the QC grows via aggregation of possible clusters in the initial stage. Pd or Pt atoms stabilize and/or connect individual Zr-centered icosahedral clusters, facilitating the formation of the nucleus and growth of the QC phase.

Original languageEnglish
Article number175303
JournalJournal of Physics Condensed Matter
Volume23
Issue number17
DOIs
Publication statusPublished - 2011 May 4
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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