Structural vacancies in Al-Pd-Mn quasicrystal and its (1/1, 2/1)-AlPdMnSi approximant crystals: Positron lifetime studies

Y. Takagiwa, J. T. Okada, K. Kimura, H. Kitahata, Y. Matsushita, I. Kanazawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Positron annihilation lifetimes of the stable icosahedral (i) Al-Pd-Mn quasicrystal and its (1/1, 2/1)-AlPdMnSi and 1/0-Al12Re approximant crystals were measured at ambient temperature. The observed single-lifetime of the i-Al-Pd-Mn quasicrystal is very close to that of the (1/1, 2/1)-AlPdMnSi approximant crystals, indicating that the same type of structural vacancies exists in all these specimens. On the other hand, the lifetime of 1/0-Al 12Re approximant crystal, which has no structural vacancies, is significantly shorter than the above results. We discuss the relationship between the positron lifetimes and mean valence-electron density.

Original languageEnglish
Pages (from-to)1929-1934
Number of pages6
JournalPhilosophical Magazine
Volume88
Issue number13-15
DOIs
Publication statusPublished - 2008 May 1
Externally publishedYes

Keywords

  • Approximants
  • Positron annihilation
  • Quasicrystals

ASJC Scopus subject areas

  • Condensed Matter Physics

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