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The structure of the (Al, Cu) 13 Co 4  phase was determined by powder X-ray diffractometry and Rietveld refinement for 2,4,5 and 6 at.% Cu. The increase in the copper content is realized by the permanent replacement of the Al atoms by Cu in the ( x 0 z ) plane of the binary Al 13 Co 4  structure. For up to 2 at.% of Cu this occurs at the (0.5, 0, 0.5) position. For the higher Cu content its atoms occupy completely or partially two other positions, whose coordinates for the 6 at.% Cu phase are (0.890, 0, 0.200) and (0.075, 0, 0.777). No partial occupancies of pure Al-sites are suggested for the 2–6 at.% Cu.

The structure of the (Al, Cu) 13 Co 4 phase with different Cu content