Hyperfine Interactions

, Volume 55, Issue 1–4, pp 1093–1097 | Cite as

Local iron symmetry in quasicrystals

  • R. D. Werkman
  • I. Vincze
  • P. J. Schurer
  • F. van der Woude
Non-crystalline Materials

Abstract

Iron sites in quasicrystalline Al(TFe)-alloys have been investigated with Mössbauer spectroscopy. The quadrupole splitting of these materials is about 0.4 mm/s, showing that the iron atom is not in an icosahedral\((m\bar 3\bar 5)\) site. A measurement in an external magnetic field ofHext≈5 T yields the asymmetry parameter η=(V xx −V yy )/V zz . The value of η enables one to decide between the applicability of some mathematical structure models of quasicrystals.

The results are:

η=0.8 for decagonal Al7(Mn0.7Fe0.3)2

η=0.9 for icosahedral Al6Cr0.7Fe0.3

using an one site approximation. This means that the iron atoms are in sites with a symmetry lower than axially symmetry, which suits very well for a Penrose lattice.

Keywords

Iron Spectroscopy Magnetic Field Thin Film External Magnetic Field 

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Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1990

Authors and Affiliations

  • R. D. Werkman
    • 1
  • I. Vincze
    • 1
  • P. J. Schurer
    • 1
  • F. van der Woude
    • 1
  1. 1.Solid State Physics LaboratoryMaterials Science Centre University of GroningenGroningenThe Netherlands

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