J. Phys. I France
Volume 5, Numéro 7, July 1995
Page(s) 771 - 776
DOI: 10.1051/jp1:1995167
J. Phys. I France 5 (1995) 771-776

Evidence for Atomic Hopping of Fe in Perfectly Icosahedral AlfeCu Quasicrystals by $^{\bf 57}$Fe Mössbauer Spectroscopy

Gerrit Coddens1, 2, Sandrine Lyonnard1, Bogdan Sepiol3 and Yvonne Calvayrac4

1  Laboratoire Léon Brillouin, C.E.A./C.N.R.S., 91191 Gif-sur-Yvette Cedex, France
2  Neutron Scattering Project, I.I.K.W., University of Antwerp, 2610 Wilrijk, Belgium
3  Institut für Festkörperphysik der Universität Wien, 1090 Wien, Austria
4  C.E.C.M./C.N.R.S., 94407 Vitry Cedex, France

(Received 29 March 1995, received in final form and accepted 3 May 1995)

By 57Fe Mössbauer spectroscopy in a special experimental set-up we have shown the existence of Fe atomic jumps in Al 62Fe 25.5Cu 12.5 perfect icosahedral quasicrystals. The (preliminary) results indicate that at 790 $^{\circ}$C 20% of the Fe atoms are jumping at a time scale corresponding to 4  $\mu{\rm e}$V.

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