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Figure 5
Projections of the unit cells of the structures AT-19, ACT-45 and ACT-71 along a main axis. Ta atoms are shown in brown, Al atoms in light blue and mixed Al/Cu positions in dark blue. Despite the well defined cluster structure, a clear organization into atomic layers containing subcells is obvious, as known from Frank–Kasper phases. However, these subcells are not related to the average structure common to all three phases.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 65| Part 3| May 2009| Pages 308-317
doi:10.1107/S0108768109014001
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