Abstract
Ordered structures of Au3Cd with a double hexagonal stacking sequence (4H) have been investigated by 1 MV electron microscopy in combination with many-beam dynamical calculations. One- and two-dimensional long-period superstructures (LPS) were observed at atomic level by high-resolution images with [001] incidence. The two-dimensional LPS was determined to be isomorphic with the Au77Mg23 structure. Two-dimensional LPS with stacking sequences 6Hand 9R were also found in the composition range 24–31 at.%Cd.
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