Composition dependence of the atomic structure of AlxMg39·5Zn60· 5-x(20·5 ≤ x ≤ 50·5) 1/1 - 1/1 - 1/1 approximants determined by the rietveld method

U. Mizutani, W. Iwakami, T. Takeuchi, M. Sakata, M. Takata

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27 Citations (Scopus)

Abstract

The atomic structure of the AlxMg39.0Zn60.5-x(20-5≤x≤ 50-5) 1/1 - 1/1 -1/1 approximants has been determined as a function of the Al concentration x by applying the Rietveld method to the X-ray powder diffraction data. The refinement was accomplished by using the data due to Bergman et al. as starting parameters- It is shown that the centre of the cluster is only 10% occupied by the Al atom at x = 20·5 but becomes essentially vacant when x exceeds 30. The sites corresponding to the vertex of the icosahedral cluster in the first shell are 80% occupied by the Zn atoms and the remaining sites by the Al atoms in the concentration range x ≤40. We also point out, from the Al concentration dependence of the interatomic distance of various atomic pairs, that the free-electron-like bonding mechanism dominates the Al-Mg-Zn approximants. This is consistent with previous studies of the electronic structure for the present approximants.

Original languageEnglish
Pages (from-to)349-356
Number of pages8
JournalPhilosophical Magazine Letters
Volume76
Issue number5
DOIs
Publication statusPublished - 1997 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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