Chemical decoration in cubic approximant and quasicrystal in the Al–Cu–Fe system

Abstract

The local order in the Al–Cu–Fe quasicrystal and in two of its approximants has been investigated by extended X-ray absorption fine structure (EXAFS) studies at the Cu and Fe K-edges. The chemical occupation of the crystallographic sites in the 1/1 cubic α-Al₅₅Si₇Cu_25.5Fe_12.5 phase is revisited. From these results, a model for the chemical short-range order in the Al₆₂Cu_25.5Fe_12.5 quasicrystal is proposed.