Abstract
Icosahedral alloys with the composition Al 62Cu 25.5TM 12.5 (TM ≡ V, Cr, Mn, Fe, Co, Ni) were prepared by melt spinning. Prevailing icosahedral phases were found for TM ≡ Cr, Mn and Fe. Phonon and random phason disorder were evaluated by an analysis of X-ray diffraction linewidths. A marked chemical trend was noted for phonon-type disorder, which increases in the sequence Fe < Mn < Cr. The parameter of the hypercubic lattice for the Mn-based icosahedral phase allows information to be derived on the metallic valence of Mn and its local coordination via the effective atomic radius.
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